2005年中科院自动化所考博-控制理论试题及部分参考答案
中国科学院2005年研究生入学考试《物理化学_春_》试题
（
） 。 （A） k1c Br2
2 (B) k1c Br
(C) k1c Br2 I a
(D) k1 I a
0 14、已知 H2O 在 298k 时的 f Gm 237.19 kJmol-1，则酸性介质中氧电极的标准
0 摩尔分数 x H 2O 0.98 , 此时溶液中和纯水中的化学势之差 H 2O H 为（ 2O
） 。
(A) -50.06Jmol-1 (B) 50.06Jmol-1 (C) -9692.3Jmol-1 (D) 9692.3Jmol-1 11、 在 298K 下， 以下电解质溶液的浓度相同时， 离子平均活度系数最大的是 （ ） 。 (A) MgSO4 (B) NaCl (C) MgCl2 (D) Na3PO4 12、某二级反应在 313K 时的反应速率常数为 2.86dm3 mol-1 min-1。已知其速率常数 的温度系数为 3.1，则 333K 时其速率常数的温度系数为（ ） 。 3 -1 -1 3 -1 -1 (A) 8.87dm mol min (B) 27.48dm mol min 3 -1 -1 (C) 3.36dm mol min (D) 1.08dm3 mol-1min-1
试题名称：物理化学 第 2 页 共 3 页
少？ 2、 （5 分） 写出下列反应的氧化和还原电极反应： Fe2+(aq) + 1/2Cl(g) Fe3+(aq) + Cl-(aq) 并计算该电池的 E0 及rG0。 （已知 E0（Fe3+/Fe2+=0.770V, E0(Cl2/Cl-)=1.358V） 。 3、 （10 分） FeCl3 水解可制得 Fe(OH)3 溶胶（FeCl3 稍过量） 。 （1） 写出 Fe(OH)3 溶胶的胶团结构表示式。 （2） 在一个烧瓶中盛有 50cm3 的 Fe(OH)3 溶液，加入 NaCl 溶液使溶胶发生 沉淀，最少需加入 1.0 moldm-3 的 NaCl 52 cm3 ，计算 NaCl 的聚沉值。 （3） 根据叔尔采-哈迪价数规则，估计使该溶胶聚沉约需 2.110-2 moldm-3 的 Na2SO4 或 3.510-2 moldm-3 的 Na3PO4 各多少 cm3？ 4、 （5 分） 20℃时测得水在某固体上的接触角为 115o, 计算水在该固体上的铺展系数。已 知 20℃时水的表面张力为 72.7510-3 Nm-1。 5、 （10 分） 300K 时若某物质 A 的分解反应为一级反应， 初速率 v0=1.0010-5 moldm-3S-1， 1h 后的速率 v1=3.2610-6 moldm-3 S-1，求 300K 时 （1） 反应速率常数 k 和半衰期 t1/2。 （2） 求 A 的初始浓度 cAo 和 2h 后的浓度 cA 。 6、15 分 1mol 水在 373.2K 及 101325Pa 的始态下反抗恒外压 50662.5Pa 等温蒸发至 5.662.5Pa 的蒸汽，然后缓慢地逐渐加压变为 373.2K、101325Pa 的水蒸汽，求此过 程的 Q、W、U 和H。已知水在正常沸点下的汽化焓为 2255Jg-1，设 H2O(g)为理 想气体。 7、15 分 1mol 理想气体从始态 298.15K、101325Pa，分别进行下列可逆过程，求G。 （1） 恒温下压力加倍。 （2） 恒压下体积加倍。 （3） 恒容下压力加倍。 假定在始态气体的摩尔熵为 195 JK-1mol-1， CV, -1 -1 m=20.92 JK mol 。 （4） 若G<0，是否意味着过程是不可逆的？
05年10月考博英语A卷
05年10⽉考博英语A卷中国科学院博⼠研究⽣⼊学考试英语试卷2005年10⽉------------------------------------------------------------------------------------------------THE CHINESE ACADEMY OF SCIENCESENGLISH ENTRANCE EXAMINATION FORDOCTORAL CANDIDATESOctober 2005PAPER ONEPART I VOCABULARY (15 minutes, 10 points, 0.5 point each)Directions: Choose the word or expression below each sentence that best completes the statement, and mark the corresponding letter of your choice with a single baracross the square brackets on your Machine-scoring Answer Sheet.1. Marine biologists are calling for Cardigan Bay to be redeveloped as a marine nature _______ to protect the dolphins.A. reservationB. rescueC. reserveD. refugee2. Police have planned a reconstruction of the crime tomorrow in the hope that thiswill ________ the memory of the passers-by.A. keepB. easeC. jogD. enhance3. Diamonds have little ________ value and their price depends almost entirely on their scarcity.A. intricateB. intactC. intriguingD. intrinsic4. At the moment she is ________ the netball match between the Japanese team andthe Cuban team over at the playing field.A. arbitratingB. interveningC. refereeingD. deciding5. Any time ________, any period of waiting is because you haven't come and received the message.A. errorB. cutC. lackD. lag6. James Joyce was __________ as the greatest writer of the 20th century.A. salutedB. estimatedC. scaledD. measured7. As a moralist, Virginia Woolf works by indirection, subtly undermining officially accepted mores, mocking, suggesting, and calling values into question ______ asserting, advocating or bearing witness.A. rather thanB. other thanC. together withD. as well as8. Scientists hope the collision will produce a large crater in the comet’s surface in order to reveal the core and give some _________ to the origin of the solar system.A. sourcesB. interpretationsC. cluesD. observations9. The Japanese Prime Minister’s _________ is a seat on the UN Security Council, for which he will be lobbying at the summit.A. precedenceB. promiseC. priorityD. procedure10. This cycle of growth, reached its peak in 1986, when the annual rate of growthwas ________ 12 percent.A. in case ofB. in view ofC. in face ofD. in excess of11. How well a person __________ depends just as much on whether they’re self-confident as it does on particular skills and expertise.A. jumps outB. turns outC. covers upD. turns up12. The skin of the forest keeper _________ exposure to the harsh northwest weather.A.is tanned fromB.is colored fromC. is tainted byD. is encoded by13. The Court of Auditors of the EU is an _________ body and acts independently from all other institutions.A. indifferentB. imperativeC. impartialD. incoherent14. Since it is too late to change my mind, I am _________ to carrying out the plan.A. committedB. obligedC. engagedD. resolved15. The possibilities of an autumn election cannot be _________.A. struck outB. left outC. ruled outD. counted out16. Hotels and restaurants are an ____ part of the city; without them the city’s tourist industry cannot exist.A. insignificantB. integralC. interiorD. inevitable17. I reject any religious doctrine that does not _______ to reason and is in conflict with morality.A. applyB. appealC. attractD. attend18. There are three bodies of writing that come to _________ this question and wewill consider each in turn.A. bear onB. sort outC. figure outD. put on19. Success does not ________ in never making mistakes but in never making thesame one a second time.A. compriseB. conveyC. consistD. conform20. Thousands perished, but the Japanese wished to ________ the extent of the cruelacts committed by their soldiers.A. live up toB. mark downC. size upD. play downPART II CLOZE TEST (15 minutes, 15 points)Directions:For each blank in the following passage, choose the best answer from the four choices given below. Mark the corresponding letter of your choice with a single bar across the square brackets on your Machine-scoring Answer Sheet. Healthy guilt is a warning signal that either something dangerous is about to happen or something has already happened that needs ___21___. A feeling of distress is good when it keeps us from ___22___ our own values. It serves a useful function. Here is a(n) ___23___: If a fire broke out in someone's home ___24___ faulty wiring, he would not be content with ___25___ putting out the fire. ___26___, he would have the house rewired. When we feel guilty about something, we have to make the necessary changes in our character to prevent a ___27___.Unhealthy guilt is a distressful feeling which occurs without reason or persists even after appropriate steps have been taken to deal with a situation. A person with___28___ self-esteem may react to feelings of guilt in one of two ways: ___29___ that he has done wrong in order to protect his fragile ego; or experience the feeling as a ___30___ that he is just an unworthy person. An example involves the case of Mr. L. He has a ___31___ with Mr. Y and exchanges angry words. Later that day, Mr. Y gets sick. Mr. L may feel that he was the ___32___of Mr. Y's misfortune. Mr. L feels unwarranted guilt for the misfortune and thinks that his angry feelings caused the misfortune. This is irrational thinking and is ___33___ of pathological guilt.When people do research on a particular challenge and make a decision, the decision may ___34___ unfavorable consequences. Feeling distress and pain is normal. However, feeling guilty over the idea that you caused the consequences is unhealthy. As long as a decision is made with proper advice and with good intent, then the person remains morally right ___35___ having made the decision. There is no reason for guilt.21. A. connection B. correction C. recovery D. repetition22. A. underestimating B. displaying C. violating D. deteriorating23. A. hypothesis B. definition C. experiment D. analogy24. A. due to B. but for C. with D. under25. A. devotedly B. primarily C. timely D. merely26. A. Therefore B. Rather C. Anyway D. Consequently27. A. distress B. renewal C. conflict D. recurrence28. A. low B. exalted C. sincere D. much29. A. Imply B. Admit C. Deny D. Argue30. A. prescription B. communication C. confirmation D. perception31. A. contact B. disagreement C. relationship D. concern32. A. cause B. origin C. cure D. witness33. A. record B. proof C. evidence D. description34. A. attach to B. turn to C. lead to D. take to35. A. at B. in C. as D. forPART III READING COMPREHENSIONSection A (60 minutes, 30 points)Directions: Below each of the following passages you will find some questions or incomplete statements. Each question or statement is followed by fourchoices marked A, B, C, and D. Read each passage carefully, and then selectthe choice that best answers the question or completes the statement. Markthe letter of your choice with a single bar across the square brackets on yourMachine-scoring Answer Sheet.Passage OneJeans were invented a little over a century ago and are currently the world's most popular, versatile garment, crossing boundaries of class, age and nationality. From their origins as pure workwear, th ey have spread through every level of the fashion spectrum, and are embraced internationally for their unmatched comfort and appeal.In the mid '40s, the Second World War came to an end, and denim blue jeans, previously worn almost exclusively as workwear, gained a new status in the U.S. and Europe. Rugged but relaxed, they stood for freedom and a bright future. Sported byboth men and women, by returning GI’s and sharp teenagers, they seem ed as clean and stron g as the people who chose to wear them. In Europe, surplus Levi's were left behind by American armed forces and were available in limited supplies. It was the European population's first introduction to the denim apparel. Workwear manufacturers tried to copy the U.S. originals, but those in the know insisted on the real thing.In the 50s, Europe was exposed to a daring new style in music and movies and consequently jeans took on an aura of sex and rebellion. Rock'n'roll coming from America blazed a trail of defiance, and jeans became a symbol of the break with convention and rigid social mores. When Elvis Presley sang in "Jailhouse Rock," his denim prison uniform carried a potent, virile image. Girls swooned and guys were quick to copy the King. In movies like "The Wild One" and "Rebel Without a Cause," cult figures Marlon Brando and James Dean portrayed tough anti-heroes in jeans and T-shirts. Adults spurned the look; teenagers, even those who only wanted to look like rebels, embraced it.By the beginning of the '60s, slim jeans had become a leisurewear staple, as teens began to have real fun, forgetting the almost desperate energy of the previous decade, while cocooned(包围在) in wealth and security. But the seeds of change had been sown, and by the mid '60s jeans had acquired yet another social connotation---as the uniform of the budding socialand sexual revolution. Jeans were the great equalizer, the perfect all-purpose garment for the classless society sought by the Hippy generation. In the fight for civil rights, at anti-war demonstrations on the streets of Paris, at sit-ins and love-ins everywhere, the battle cry was heard above a sea of blue.36.Jeans were first designed for _______.A.soldiersB.WorkmenC. TeenagersD. cowboys37.In the mid 40s, jeans gained popularity because ________.A. they made the wearer look clean and toughB. they were comfortable and looked friendlyC. they were the outward symbol of the mainstream societyD. they stood for freedom and a strong character38.What does the ―real thing‖ refer to in the second paragraph?A.authentic Levi’sB.workwearC. casual wearD. jeans of European style39.The popularity of Elvis Presley’s way of dressing illustrates that _________.A.teenagers wanted to look sexyB.people desired to look strong and manlyC.jeans went well with rock’n’rollD.D.Americans were more rebellious than Europeans40. The last sentence suggests that jeans were ________./doc/61c5a61755270722192ef7c4.html ed for military purposesB.the symbol of the ideal of social equalityC.worn by all kinds of peopleD. the outfit of social improvementPassage TwoThe ethnic group known as Ashkenazim is blessed with more than its fair share of talented minds, but is also prone to a number of serious genetic diseases.Researchers now suggest that intelligence is closely linked to several illnesses in Ashkenazi Jews, and that the diseases are the result of natural selection.The Ashkenazim are descended from Jewish communities in Germany, Austria, Poland, and Eastern Europe that date back to the 10th century. Today they make up approximately 80 percent of the world's Jewish population.Ashkenazim have the highest average IQ of any ethnic group, scoring 12 to 15 points above the European average. They are also strongly represented in fields and occupations requiring high cognitive ability. For instance, Jews of European ancestry account for 27 percent of U.S. Nobel science prize winners.But the group is also associated with several neurological disorders, including Tay-Sachs, Gaucher's, and Niemann-Pick. Tay-Sachs is a fatal hereditary disease of the central nervous system. Sufferers lack an enzyme needed to break down fatty substances in the brain and nerve cells. Gauchers and Niemann-Pick are similar, often fatal diseases.Because Jews were discriminated against in medieval Europe, they were often driven into professions such as moneylending and banking which were looked down upon or forbidden for Christians.Historians suggest that Jews with lucrative jobs often had four, six, or sometimes even eight or nine children. Poorer families, meanwhile, tended to be smaller, possibly because they lived in overcrowded areas in which children were more prone to disease. As a result, the researchers say, over hundreds of years the Jewish population of Europe became more intelligent than their gentile countrymen.But increased intelligence may have come at a cost, with genetic diseases such as Tay-Sachs being side effects of genes that facilitate intelligence. Researchers argue that it's highly unlikely that mutated genes responsible for these illnesses could have reached such high levels in Ashkenazim if they were not connected to cognitive performance.While the link is difficult to prove, there is some evidence that Gaucher disease does increase a person’s IQ. Around one in three people of working age who were patients of the Gaucher Clinic at the Shaare Zedek Medical Centre in Jerusalem had professions requiring an average IQ of more than 120. This group included scientists, academics, physicians, and accountants.Modern-day Ashkenazim are now far more likely to marry outside their ethnic group. A researcher says that he would expecta tendency for both higher IQs and associated genetic disorders to become less marked over time.41. According to the first paragraph, Ashkenazim are _______.A.more intelligent than other JewsB.more likely to be sick than other JewsC.endowed with natural ability because of genetic diseasesD.more likely to be born with genetic diseases42. According to the article, Ashkenazim are related to the Jewish people in ______.A.the whole Europe and Eastern AsiaB. B. Eastern Europe and a few other European countriesC.Eastern Europe and a few Asian countriesD.Eastern Europe and Germany43. Tay-Sachs, Gaucher’s and Niemann-Pick are _______.A.diseases caused by absence of an enzymeB.life-threatening genetic diseasesC.diseases that make people more intelligentD.the same disease with different terms44.The ―lucrative job‖ may most probably be a job which is _______.A.ProfitableB.unsteadyC.challengingD.permanent45.The underlined sentence in paragraph 7 roughly means that the researchersbelieve that _______.A. mutated genes have a negative influence on Ashkenazim’s intelligenceB. mutated genes have played a role in Ashkenazim’s intelligenceC. the Ashkenazim’s high intelligence is caused by the mutated genesD. the Ashkenazim’s illnesses have greatly handicapped their performance46.From the passage, it can be anticipated that in the future ________.A.Ashkenazim would be less intelligent but healthierB.there would be more outstanding Ashkenazim intellectualsC.Ashkenazim would be more intelligent and less healthyD.the cause of genetic diseases would be explored more deeplyPassage ThreeSometimes it's just hard to choose. You're in a restaurant and the waiter has his pen at the ready. As you hesitate, he gradually begins to take a close interest in the ceiling, his fingernails, then in your dining partner. Each dish on the menu becomes a blur as you roll your eyes up and down it in a growing panic. Finally, you desperately opt for something that turns out to be what you hate.It seems that we need devices to protect us from our hopelessness at deciding between 57 barely differentiated varieties of stuff - be they TV channels, gourmet coffee, downloadable ring tones, or perhaps, ultimately even interchangeable lovers. This thought is opposed to our government's philosophy, which suggests that greater choice over railways, electricity suppliers and education will make us happy. In my experience, they do anything but.Perhaps the happiest people are those who do not have much choice and aren’t confronted by the misery of endless choice. True, that misery may not be obvious to people who don't have a variety of luxuries. If you live in Madagascar, say, where average life expectancy is below 40 and they don't have digital TV or Starbucks, you might not be impressed by the anxiety and perpetual stress our decision-making paralysis causes.Choice wasn't supposed to make people miserable. It was supposed to be the hallmark of self-determination that we so cherish in capitalist western society. But it obviously isn't: ever more choice increases the feeling of missed opportunities, and this leads to self-blame when choices fail to meet expectations. What is to be done? A new book by an American social scientist, Barry Schwartz, called The Paradox of Choice, suggests that reducing choices can limit anxiety.Schwartz offers a self-help guide to good decision making that helps us to limit our choices to a manageable number, and ultimately derive greater satisfaction from the choices we make. This is a capitalist response to a capitalist problem.But once you realize that your Schwartzian filters are depriving you ofsomething you might have found enjoyable, you will experience the same anxiety as before, worrying that you made the wrong decision in drawing up your choice-limiting filters. Arguably, we will always be doomed to buyers' remorse and the misery it entails. The problem of choice is perhaps more difficult than Schwartz allows.47.The waiter mentioned in Paragraph 1 would agree that given a variety of choice_______.A. it is common for his customer to hesitate in ordering a mealB. it is impolite for his customer to order with hesitationC. it is difficult for his customer to expect quality foodD. it is possible to get to know his customer’s partner48.It is implied that it is the government’s inten tion to _______.A.improve the quality of TV programsB.try to offer greater choice over public service systemsC.make people realize that some lovers are interchangeableD.encourage the downloading of a variety of ring tones49.We can infer that the author’s attitude toward s choice is that _______.A.the more choice we have, the more freedom we can enjoyB.endless choice has only made us more miserableC.it is easy for people to make a wrong decision with few choicesD. before we make decisions, we want as many choices as possible50.The author mentioned ―Starbucks‖ in Paragraph 3 as an illustration of _______.A.happinessB.low life expectancyC. perpetual stressD. luxury51.From Barry Schwartz’s book, The Paradox of Choice, we can getrecommendation tips on _______.A. how to handle the situation of capitalist exploitationB.how to deal with your expense budgetC. how to avoid the feeling of missed opportunitiesD.how to save money by making a right choice52.We may conclude that it is NOT one of the author’s purposes to _______.AAA. stress the problem of choiceB.discuss decision-making paralysisC. make an analysis of buyers’ remorseD. promote the new book The Paradox of ChoicePassage FourMany things make people think artists are weird –the odd hours, the nonconformity, the clove cigarettes. However, the weirdest may be this: artists’ only jobs are to explore emotions, and yet they choose to focus on the ones that feel lousy. This wasn’t always so. The earliest forms of art, like painting and m usic, are those best suited for expressing joy. But somewhere in the 19th century, more artists began seeing happiness as insipid, phony or, worst of all, boring. In the 20th century, classical music became more atonal, visual art more unsettling.Sure, there have been exceptions, but it would not be a stretch to say that for the past century or so, serious art has been at war with happiness. In 1824, Beethoven completed his ―Ode to Joy‖. In 1962, novelist Anthoy Burgess used it in A Clockwork Orange as the favorite music of his ultra-violent antihero.You could argue that art became more skeptical of happiness because modern times have seen such misery. But the reason may actually be just the opposite: there is too much damn happiness in the world today.In the West, before mass communication and literacy, the most powerful mass medium was the church, which reminded worshippers that their souls were in peril and that they would someday be meat for worms. Today the messages that the average Westerner is bombarded with are not religious but commercial, and relentlessly happy. Since these messages have an agenda –to pry our wallets from our pockets –they make the very idea of happiness seem bogus(假的). ―Celebrate!‖commanded the ads for the arthritis drug Celebrex, before we found out it could increase the risk of heart attack.What we forget – what our economy depends on us forgetting – is that happiness is more than pleasure without pain. Thethings that bring the greatest joy carry the greatest potential for loss and disappointment. Today, surrounded by promises of easy happiness, we need someone to tell us that it is ok not to be happy, that sadness makes happiness deeper. As the wine-connoisseur movie Sideways tells us, it is the kiss of decay and mortality that makes grape juice into Pinot Noir. We need art to tell us, as religion once did, that you will die, that everything ends, and that happiness comes not in denying this but in living with it. It’s a message even more bitter tha n a clove cigarette, yet, somehow, is a breath of fresh air.53.What is most strange about artists?A. They wear special clothes.B. They rarely work in the daytime.C. They mainly depict distressing things.D. They are liable to take illegal drugs.54.What does the author mean by ―a stretch‖?A.a terrible thingB.an exaggerationC.a continuous period of timeD.an exception55.The example that ―Ode to Joy‖ was used in Burgess’s novel is meant to illustratethat _______.A.musicians and novelists share similar artistic tasteB.violent people have a strong desire to be happyC.serious art is often contradictory with happinessD.music is enjoyed by good and bad people alike56.The word ―Celebrex‖ in the advertisement ________.A.misleads people into buying dangerous drugsB.reminds people of a cheerful feelingC.boasts of the effectiveness of a drug/doc/61c5a61755270722192ef7c4.html es from a religious term57.How could the economy depend on our forgetting things?A.The economy would not be boosted if everybody were satisfied.B.There are many new products designed for the forgetful.C.People will spend more money if we believe in easy happiness.D.We pay heavily for forgetting things easily.58.What does the author imply with the movie Sideways?A.Happiness can be found through pains and efforts.B.Happiness comes when everything dies.C.Happiness makes sadness deeper.D.Happiness is not a good thing.Passage FiveAs students return to school this fall, parents will again worry about new illnesses as kids come into contact with flu germs. There are other risks they should worry about—illnesses caused by the common bugs and rodents found in school buildings. Perhaps the even more dangerous pests however are those individuals who prevent school administrators from swiftly addressing these problems.Anti-chemical activists have pushed, and nearly 20 states and local governments have passed, laws to eliminate or drastically reduce the use of pesticides in schools. Yet pesticides are used to control roaches, mice, rats, mosquitoes, and other pests. The public health implications of allowing these things to get out of control should be obvious: increased allergies and illnesses related to insect and rodent bites.Some states have passed a seemingly more reasonable policy that demands that school administrators provide notification 48 to 72 hours before using pesticides. But such laws allow problems to escalate during waiting periods when an urgent response is warranted. Notification paperwork burdens also consume limited financial resources. Journalist Steve Milloy reported that the notification law of Maryland costs the state’s schools $32,000 annually.Parents should fear these laws and the pests they harbor more than the pesticides. Environmental Protection Agency(EPA) pesticide standards are so exceedingly cautious that the risks are tiny when the product is used according to label directions. An analysis done by the University of Texas found that the EPA’s risk estimates overstate pesticide exposure damage at a level hundreds of thousands of times greater than the risk of actual exposure.Meanwhile, many of the pests in schools pose serious risks. Allergies and asthma are a particular concern. According to one study published in Environmental Health Perspectives: ―Allergens associated with dust mites and cockroaches are probably important in both onset and worsening of asthma symptoms for children who are chronically exposed to these agents.‖Cockroach allergies are particularly problematic. Children who suffered from this type of allergy missed more days of school and lost more sleep than children suffering from other allergies.Prudent use of chemicals—not reduced pesticide use—can be a big part of the solution. A study in the Journal of Allergies and Clinical Immunology showed that use of chemical baits and regular cleaning can reduce indoor cockroach allergens to levels below that which causes allergies.If people are truly concerned about public health in schools, it’s time to start looking at priorities. Rather than liberate the pests, they should liberate the schools from silly government regulations and dangerous vermin.59. The author implies that parents should be most concerned about __________.A.flu germsB.pestsC.school administratorsD.anti-chemical activists60. The author would most probably agree that the laws restricting the use of pesticides in schools _________.A.are necessaryB.are harmfulC.are quite effectiveD.reflect health concerns61. The third paragraph shows that in schools ________.A. sometimes pesticides should be used immediatelyB. the cost of using pesticides is very highC.the laws about using pesticides are not properly observedD. using pesticides is a daily routine62. Regarding pesticides, the author thinks that _________.A. their danger has been exaggeratedB. their effects have been proved by EPAC. they are not effective for killing some pestsD.they may cause some illnesses in children63. Allergens associated with cockroaches may ________.A. kill some insectsB. trigger genetic problemsC. cause asthma symptomsD. create environmental pollution64. As a result of cockroach allergies, children may have difficulty with _______.A.hearingB.digesting/doc/61c5a61755270722192ef7c4.html municatingD.sleeping65. What is the main idea of the passage?A. New chemicals should be developed to control pests.B. Pesticides should be used frequently to control pests.C.Some policies have ruined the efforts to control pests.D. Schools have ignored the need to control pests.Section B ( 20 minutes, 10 points)Direction: In each of the following passages, five sentences have been removed from the original text. They are listed from A to F and put below the passage. Choosethe most suitable sentence from the list to fill in each of the blanks (numbered66 to 75). For each passage, there is one sentence that does not fit in any ofthe blanks. Mark your answers on your Machine-scoring Answer Sheet.Passage OneTHE LONDON terrorist attacks on July 7 and July 21 changed British Prime Minister Tony Blair. He had long been reluctant to make the fight against Islamo-fascist terror a domestic issue. Last week he outlined security measures to deal with radical clerics who incite violence.Of particular interest is a measure that reads in part: "It is now necessary, in order to acquire British citizenship, that people attend a citizenship ceremony [and] swear allegiance to the country." That's not much different from U.S. law. ___66___ This requirement would violate Section 203 of the U.S. V oting Rights Act, which requires that bilingual election materials and assistance be made available when a foreign language reaches critical mass in the general population. For example, California recall ballots in Los Angeles County were printed in English, Spanish, Chinese, Vietnamese, Japanese, Korean and Tagalog. ___67___U.S. law, in effect, tells new citizens that they can be fully engaged in U.S. democracy without understanding the language of its election campaigns. ___68___ Naturalized citizens must demonstrate a fundamental understanding of U.S. history and civics. Isn't it reasonable to expect them also to be able to communicate, at a basic level, in the language of U.S. politics?___69___ Requiring citizens to understand basic English isn't bias. But supporting a system that encourages American citizens to accept a life without meaningful participation in politics and civic life —that's bias.To end the separatism and disengagement that flourishes in part because significant portions of his country cannot speak English, Blair wants to make basic knowledge of English a requirement for British citizenship. There can be no true national。
中科院《无机化学》2005-2012考研真题及答案(很清晰)
中国科学院研究生院2012年招收攻读硕士学位研究生入学统一考试试题科目名称：无机化学考生须知：1．本试卷满分为150分，全部考试时间总计180分钟。
2．所有答案必须写在答题纸上，写在试题纸上或草稿纸上一律无效。
3．可以使用无字典存储和编程功能的电子计算器。
一、选择题 ( 共20题，每题2分，共40分 )1.下列各氧化物中，金属的原子轨道中不存在单电子的是：(A) Mn 3O 4 (B) Fe 3O 4 (C) Pb 3O 4 (D) Cr 2O 32. 根据软硬酸碱理论，下列金属离子中，最软的酸是：(A) Zn 2+ (B) Ca 2+ (C) Mn 2+ (D) Ni 2+3.下列金属中，与汞不能生成汞齐合金的是：(A) Zn (B) Ag (C) Fe (D) Cu4. 主量子数n=4, m s =1/2时，可允许的最多电子数为：(A) 6 (B) 16 (C) 12 (D) 85. 下列叙述正确的是：(A) 在复合反应中，反应级数与反应分子数必定相等(B) 通常，反应活化能越小，反应速率常数越大，反应越快(C) 加入催化剂，使正反应和逆反应的活化能减小相同的倍数(D) 反应温度升高，活化分子数减低，反应加快6. 下列含氧酸盐中热稳定性最差的是：(A) K 2CO 3 (B) ZnCO 3 (C) CaCO 3 (D) Na 2CO 37. 下列离子半径从小到大顺序正确的是：(A) Li +< Na +< Mg 2+<F -<S 2- (B) Li +< F - < Na + < Mg 2+<S 2-(C) Li +< Na + < F -< S 2- < Mg 2+ (D) Li +< Mg 2+ < Na + < F -<S 2-8. 下列物种中，键角最小的是：(A) NO 2- (B) NO 2 (C) NO 2+ (D) N 2O9. H 2O 2既可作氧化剂又可作还原剂，下列叙述中错误的是：(A) H 2O 2可被氧化生成O 2 (B) H 2O 2可被还原生成H 2O(C) pH 变小，H 2O 2的还原性也增强 (D) pH 变小，H 2O 2的氧化性增强10. 在Y X 2208923292 的放射衰变中，发射出的α粒子和β粒子数为：(A) 3α和2β (B) 5α和3β (C) 5α和5β (D) 3α和3β11. 下列物质中， m f H 不等于零的是：(A) O(g) (B) Fe(s) (C) C(石墨) (D) Ne(g)12. 已知 ϕ(Cr 2O 72-/Cr 3+)＞ ϕ(Fe 3+/Fe 2+)＞ ϕ(Cu 2+/Cu)＞ ϕ(Fe 2+/Fe)，则上述诸电对的各物种中最强的氧化剂和最强的还原剂分别为：(A) Cr 2O 72-，Fe 2+ (B) Fe 3+，Cu (C) Cr 2O 72-，Fe (D) Cu 2+，Fe 2+13. 关于V 2O 5的下列叙述中错误的是：(A)是酸性氧化物 (B)是无色晶体 (C)具有强氧化性 (D)可作为催化剂14. 室温下用CCl 4萃取I 2的分配系数D ＝2I C (CCl 4 )/2I C (H 2O), CCl 4萃取AtI 的分配系数D1＝C AtI (CCl 4)/ C AtI (H 2O)，则：(A) D>D1 (B) D<D1 (C) D=D1 (D)无法确定15. 对于常见分子筛的成分中，硅铝比越大，下列说法正确的是：(A) 耐酸性强，热稳定性差 (B) 耐酸性差，热稳定性差(C) 耐酸性强，热稳定性强 (D) 耐酸性差，热稳定性强16. 仅用一种试剂，即可将Ag +, Hg 2+, Zn 2+, Fe 3+ , Ni 2+ 五种离子区分开，这种试剂可选用：(A) H 2S (B) Na 2S (C) NaCl (D) NaOH17.锰的下列物种能在酸性溶液中发生歧化反应的是：(A) MnO 42- (B) MnO 2 (C) MnO 4- (D) Mn 2+18. 下列叙述错误的是：(A) Ce(OH)3在空气中易被氧化生成黄色的Ce(OH)4(B) Ce 4+的价电子构型为4f 0(C) 镧系元素草酸盐是难溶的(D) 钍和铀是人工放射性元素19. 下列混合物中，可以制成温度最低的制冷剂体系是：(A) 水＋甘油 (B) 水＋食盐 (C) 冰＋氯化钙 (D)水＋冰20. 对于下列基元反应 A ＋ 2 B → C ，其速率常数为 k ，若某一个时刻（时间以 s 计）A 的浓度为 2 mol · L -1，B 的浓度为 3 mol · L -1，则反应速率 υ＝：(A) 6k mol · L -1 · s -1 (B) 18k mol · L -1 · s -1(C) 12k mol · L -1 · s -1 (D) 36k mol · L -1 · s -1二、填空题 ( 共 5题，共30分 )21. （每空1分）相同温度，压力，体积下，两种气体（1，2）的摩尔质量分别为M 1和M 2（M 1>M 2）试比较，物质的量1 _____ 2，质量1_____ 2，平均动能1 _____ 2，平均速度 1 _____ 2，密度 1 _____ 2。
中国科学院(中科院)考博历年试题汇总
中国科学院（中科院）考博历年试题汇总中科院发育遗传所2002生物化学（博士）注：请将试卷写在答题纸上；不用抄题，但要写请题号；草稿纸上答题无效。
一、名次解释：（20分）二、以动物细胞或植物细胞为例说明细胞中的膜结构及其功能。
（12分）三、在研究位置基因的功能时往往采用推定的该基因所编码的氨基酸序列与已知功能的蛋白质的氨基酸序列比较来推断，你认为这种比较应采用什么原则？为什么？（12分）四、真核基因在原核细胞中表达的蛋白质常常失去生物活性，为什么？举例说明。
（12分）五、简述信号肽的结构特点、功能和从蛋白质产物中切除的机理。
（12分）六、分子筛、离子交换和亲和层析是三种分离、醇化蛋白质的方法，你如何根据所要分离、纯化的蛋白质的性质选择使用。
（12分）七、酶联免疫吸附实验（ELISA）的基本原理是什么？如何用此方法检测样品中的抗原和抗体？（12分）八、某一个蛋白，SDS凝胶电泳表明其分子量位于16900于37100标准带之间，当用巯基乙醇和碘乙酸处理该蛋白后经SDS凝胶电泳分析仍得到一条带，但分子量接近标准带13370处，请推断此蛋白质的结构？为什么第二次用前要加碘乙酸？（8分）中科院发育遗传所2000-2001生物化学（博士）2000年博士研究生入学考试生物化学试题1．酶蛋白的构象决定了酶对底物的专一性，请描述并图示酶与底物相互关系的几种学说。
（20分）2．什么是DNA的半保留复制和半不连续复制？如何证明？真核细胞与原核细胞的DNA复制有何不同？（20分）3．概述可作为纯化依据的蛋白质性质及据此发展的方法。
（20分）4．简述酵解和发酵两个过程并说明两者的异同。
（15分）5．吃多了高蛋白食物为什么需要多喝水？（10分）6．在非极端环境的生物体中是否存在氰化物不敏感的呼吸作用？如果有，其可能的生物学意义是什么？（5分）以下两题中任选一题（10分）7．概述植物或微生物细胞感应（应答）环境刺激因子（如养分缺乏、热、冷、干旱、强光等）的可能的生物化学过程模式。
中国科学院2005年硕士研究生入学试题参考答案
2005年招收攻读硕士学位研究生入学考试试题试题名称： 固体物理一 回答下列问题1 简要阐述固体物理中的Born-Oppenheimer 近似（或绝热近似）。
并定性说明这种近似的物理依据。
答：原子核质量比电子大上千倍，电子的运动比核快得多，因而可以认为电子是在准静态的核构型的势场中运动。
从而可以被把电子与核的运动分开来讨论，即固体的运动简化成相对较简单的电子运动和核的运动。
2 固体中原子实运动的有效势场包括两大部分，分别说明其来源。
答：一部分是原子实间的静电相互作用，另一部分是电子态的能量对核构型的依赖关系 3 试用能带论简述导体、半导体、绝缘体中电子在能带中填充的特点。
答：金属或导体中价电子没有把价带填满，此为导带。
绝缘体中的价电子正好把价带填满，且更高的许可带与价带间的间隔较宽的禁带。
半导体与绝缘体相似，但禁带较窄。
二 简要回答下列问题1 写出晶体可能有的独立的点对称元素。
答：1、2、3、4、6、i 、m 、42 按对称类型分类，布拉菲（Bravas ）格子的点群类型有几种？空间群类型有几种？晶体结构的点群类型有几种?空间群类型有几种？答：7、14、32、2303 某种晶体的倒格子为体心立方结构，该晶体的正格子是什么结构？答：面心立方4 晶体中包含有N 个原胞，每个原胞有n 个原子，该晶体晶格振动的格波简正模式总数是多少？其中声学波和光学波各有多少？答：3nN 、其中声学波3N 、光学波（3n-3）N三 对面心立方布拉菲格子1 求格点密度最大的三个格点平面（晶面系）的面指数。
答：倒格子为体心立方，与三个最短的倒格矢相应，依次为{111}、{100}、{110} 2 画出这种格点平面上格点的排布。
答：六角、正方、正方（“面心”正方）3 设晶胞参数为a ，分别求出这三个晶面系相邻晶面的间距。
答：依次为a a a 42,21,23四 证明：如果一个布拉菲格子（或点阵）有一个对称平面，则存在平行该对称面的点阵平面系。
2005年03月考博英语试题及答案
中国科学院博士研究生入学考试英语试卷2005年3月考生须知：一、本试卷由试卷一(PAPER ONE)和试卷二(PAPER TWO)两部分组成。
试卷一为客观题，答卷使用标准化机读答题纸；试卷二为主观题，答卷使用普通答题纸。
二、请考生一律用HB或2B铅笔填涂标准化机读答题纸，画线不得过细或过短。
修改时请用橡皮擦拭干净。
若因填涂不符合要求而导致计算机无法识别，责任由考生自负。
请保持机读答题纸清洁、无折皱。
三、全部考试时间总计180分钟，满分为100分。
时间及分值分布如下：试卷一：Ⅰ听力20分钟20分Ⅱ词汇15分钟10分Ⅲ完形填空15分钟15分Ⅳ阅读60分钟30分小计110分钟75分试卷二：Ⅴ英译汉30分钟10分Ⅵ写作40分钟15分小计70分钟25分CHINESE ACADEMY OF SCIENCESENGLISH ENTRANCE EXAMINATIONFORDOCTORAL CANDIDATESMarch 2005PAPER ONEPART Ⅰ LISTENING COMPREHENSION (20 minutes, 20 points)Directions:In this section, you will hear ten short conversations between two speakers. At the end of each conversation, a question will be asked about what was said. The question will be spoken only once. Choose the best answer from the four choices given by marking the corresponding letter with a single bar across the square brackets on your Machine-scoring Answer Sheet.1. A. He needs more fresh air. B. He is willing to go out.C. He is too sick to go out.D. He opened the window.2. A. Their friemts. B. Daily activities.C. Past experiences.D. Historical events.3. A. To buy a ticket. B. To pay a fee.C. To pay back a debt.D. To buy a gift.4. A. Give information. B. State preferences.C. Ask permission.D. Attract attention.5. A. In a gymnasium. B. In an art exhibition.C. In a shop.D. In a hotel.6. A. 19 dollars each. B. 38 dollars each.C. 30 dollars altogether.D. 36 dollars altogether.7. A. Jack is a gentleman. B. Jack does everything right.C. Jack is a desirable husband.D. Jack behaves immaturely sometimes.8. A. It was remarkable to both the man and the woman.B. It was not suitable for the woman.C. The man hated this kind of movie.D. The woman complained about its quality.9. A. See how much the jacket is.B. See if the jacket there is blue.C. See if there is a cell phone in the jacket.D. See if there was anything turned in this morning.10. A. The man has caught a cold. B. The woman was caught in a rainstorm.C. The weather forecast was inaccurate.D. It rained very heavily.Directions:In this section, you will hear three short talks. At the end of each talk, there will be a few questions. Both the talk and the questions will be read to you only once. After each question, there will be a pause. During the pause, you must choose the best answer fromthe four choices given by marking the corresponding letter with a single bar across the square brackets on your Machine-scoring Answer Sheet.Questions 11-13 are based on Talk 1.11. A. Language comes from physical labor.B. Language learning is a long-term endeavor.C. Language reflects history.D. Language study is very important.12. A. Constructing a wheel. B. Making a choice.C. Coming back.D. Turning around.13. A. The overthrow of a class. B. The overthrow of a tyrant.C. The overthrow of a belief.D. The overthrow of an act.Questions 14-17 are based on Talk 2.14. A. It‟s a wonderful idea.B. It‟s not a smart thing to do.C. It‟s too difficult to put into practice.D. It‟s interesting to the decision maker.15. A. Telling people about your degrees.B. Promising that you will make good achievements.C. Introducing your job responsibilities.D. Talking about the needs of the potential employer.16. A. The results which your potential boss wants to gain with your assistance.B. The results of making more money on an international market.C. The results that the employer has seen in the past.D. The results that your potential boss does not want to see.17. A. Proving that you are capable of doing the job.B. Seeking the position that is not too high or too low for you.C. Insisting that experience is more important than knowledge.D. Claiming that you are better than any other applicant.Questions 18-20 are based on Talk 3.18. A. They exercise dogs twice a day.B. They learn how to be responsible for dogs.C. They encourage dogs to go for long walks.D. They like dogs too much to care about other things.19. A. Working for the police.B. Relaxing with other dogs.C. Protecting businesses.D. Guiding the blind.20. A. Dogs ride in public transport.B. Dogs bite their owners when in a rage.C. Vehicles run over stray dogs.D. People always keep dogs on leads.PART ⅡVOCABULARY (15 minutes, 10 points, 0.5 point each)Directions: Choose the word or expression below each sentence that best completes the statement, and mark the corresponding letter of your choice with a single bar across the square brackets on your Machine-scoring Answer Sheet.21. Giorgio, now fifteen, and Lucia, also in her teens, were reaching the of their adolescence.A. crisisB. criterionC. causalityD. credibility22. At first Jackie prayed, frozen in fear, but gradually his terror curiosity.A. put up withB. lived up toC. did away withD. gave way to23. The International Olympic Committee rejects the accusations that Beijing‟s budget-cutting move might its preparation for the games.A. degradeB. deliberateC. deployD. defend24. You are not allowed to take a second job your employer gives you permission.A. so long asB. otherwiseC. unlessD. whereas25. They continued to about and enjoy themselves until they became tired.A. strokeB. strollC. stammerD. string26. The survey asked 750 school children about the values and beliefs they from television.A. pick upB. take upC. put upD. make up27. I am grateful for your invitation, and I‟d like to accept your offer with pleasure.A. delightedB. innocentC. graciousD. prestigious28. I must you farewell right now, but on some future occasion, I hope to see you again.A. relayB. bidC. sendD. deliver29. Perhaps my dishes will not be as delicious as those which you are accustomed to eating, but I beg you to grant my and have dinner with me.A. resentmentB. requirementC. requestD. reservation30. That singular ach ievement was not just about Korea‟s arrival as a football force but as a self-confident mature nation to be seriously.A. copedB. shownC. establishedD. taken31. Europe as a unit did little by itself; it either sent for US help, or each European government acted on its own.A. incidentalB. apparentC. cohesiveD. descendent32. On 9 December, James Joyce experienced one of those coincidences which affected him at the time and which later became material for his books.A. inadequatelyB. systematicallyC. profoundlyD. simultaneously33. Embarrassed, I nodded, trying to think of some way to my error.A. make do withB. make up forC. go in forD. go along with34. Furthermore, if I were to leave him, he would , for he cannot endure to be separated from me for more than one hour.A. prevailB. presideC. perishD. persecute35. With high hopes, the company sent samples of the substance to scientists, but theycouldn‟t any practical uses for it.A. come up withB. do justice toC. get even withD. look up to36. He signed a new contract with the Dublin firm, Maunsel & Company, on more favorable than those Grant Richards had given him.A. itemsB. termsC. articlesD. specifications37. Most scientists agree this outpouring contributes to global warming, which could eventually lead to coastal flooding, weather, and widespread crop loss.A. intensiveB. extremeC. unpleasedD. unique38. There was a quick turnover of staff in the department as the manager treated his employees with contempt.A. utterB. soleC. intimateD. corresponding39. The source, who spoke on condition of anonymity, to discuss the implication of that conclusion.A. recededB. impliedC. compliedD. declined40. Childhood can be a time of great insecurity and loneliness, during which the need to be accepted by peers great significance.A. takes onB. works outC. brings aboutD. gives inPART ⅢCLOZE TEST (is minutes, 15 points)Directions: There are 15 blanks in the following passage. Read the passage through. Then, go back and choose the most suitable of the words or phrases marked A, B, C, and D for each blank in the passage. Mark the corresponding letter of the word or phrase you have chosen with a single bar across the square brackets on your Machine-scoring Answer Sheet.Can exercise be a bad thing? Sudden death during or soon after strenuous exertion on the squash court or on the army training grounds, is not unheard of. 41 trained marathon runners are not immune to fatal heart attacks. But no one knows just 42 common these sudden deaths linked to exercise are. The registration and investigation of such 43 is very patchy; only a national survey could determine the true 44 of sudden deaths in sports. But the climate ofmedical opinion is shifting in 45 of exercise, for the person recovering from a heart attack as 46 as the average lazy individual. Training can help the victim of a heart attack by lowering the 47 of oxygen the heart needs at any given level of work 48 the patient can do more before reaching the point where chest pains indicate a heart starved of oxygen. The question is, should middle-aged people, 49 particular, be screened for signs of heart disease before 50 vigorous exercise?Most cases of sudden death in sport are caused by lethal arrhythmias in the beating of the heart, often in people 51 undiagnosed coronary heart disease. In North America 52 over 35 is advised to have a physical check-up and even an exercise electrocardiogram. The British, on the whole, think all this testing is unnecessary. Not many people die from exercise, 53 , and ECGs(心电图)are notoriously inaccurate. However, two medical cardiologists at the Victoria Infirmary in Glasgow, advocate screening by exercise ECG for people over 40, or younger people 54 at risk of developing coronary heart disease. Individuals showing a particular abnormality in their ECGs 55 , they say, a 10 to 20 times greater risk of subsequently developing signs of coronary heart disease, or of sudden death.41. A. Then B. Though C. Since D. Even42. A. why B. how C. if D. what43. A. runners B. exercises C. patients D. cases44. A. initiation B. evidence C. incidence D. indication45. A. favor B. positive C. inclination D. bias46. A. good B. well C. much D. far47. A. weight B. amount C. degree D. quality48. A. however B. because C. but D. so49. A. at B. to C. for D. in50. A. taking up B. trying on C. getting over D. doing with51. A. beyond B. by C. with D. of52. A. anyone B. none C. some D. nobody53. A. of course B. at all C. after all D. by far54. A. readily B. suddenly C. already D. ready55. A. having B. had C. having been D. havePART ⅣREADING COMPREHENSION (60 minutes, 30 points)Directions: You will read five passages in this part of the test. Below each passage there are some questions or incomplete statements. Each question or statement is followed by four choices marked A, B, C, and D. Read the passage carefully, and then select the choice that best answers the question or completes the statement. Mark the letter of your choice with a single bar across the square brackets on your Machine-scoring Answer Sheet.Passage 1I myself first saw Samarkand from a rise across a wilderness of crumbling ruins and great graveyards which lie between it and the airport. Suddenly we caught a glimpse of painted towers and the great blue domes of mosques and tombs shouldering the full weight of the sky among bright green trees and gardens. Beyond the gardens and the glittering domes still were those watchful mountains and their evocative snow. I found myself thinking of the thrill I had on catching my first sight of Damascus after crossing the desert from Syria. The light, the orchards and many of the trees were the same but deeper still was the sense of coming into contact with one of the most astonishing cultures in history, the world of the one and only Allah and his prophet Muhammad. It was a world that completely overawed me.Yet the memory of Samarkand which stays with me most clearly is quite a humble one. Coming back to the city from the country on my last evening we passed some unusual elm trees and I stopped to have a look at them. They were, my guide told me, perhaps a thousand years old, older certainly than Genghis Khan. A flock of fat-tailed sheep (the same kind of sheep that my own ancestors saw a Hottentot keeping when they landed at the Cape of Good Hope 321 years ago), tended by some Tadshik children, moved slowly home in the distance. Then from the city came quite clearly the call to prayer from mosque and minaret. I had not expected any calls at all and it made no difference that some of the calls came over loud-speakers. Then beyond the trees an old manappeared on a donkey, dismounted, spread a prayer mat on the ground, and kneeling towards Mecca, he began to pray.From Samarkand I journeyed on to Bokhara which was once the holiest city in Central Asia. At one time it possessed over a hundred religious colleges and close to four hundred mosques. It drew adventurers of all races towards it as it did Marco Polo. Not many of them reached their destination. These days at what used to be one of the richest market places in the world, one buys ice-cream instead of slaves; watches and mass-produced trinkets and fizzy drinks instead of gold, silks and turquoise jewellery. Few of the four hundred mosques remain and most have vanished without even leavinga trace.56. Samarkand lies .A. in a desertB. high in the mountainsC. in front of DamascusD. between the mountains and the airport57. The author said that he was overawed by .A. the beauty of the sceneB. the sight of DamascusC. the age of the placeD. the world of Allah and Muhammad58. The author refers to his clearest memory of Samarkand as “humble” because .A. it was an ordinary scene that he rememberedB. it was his last night in the city and his last memoryC. the elm trees were older than Genghis KhanD. the trees looked impressive in the evening light59. The author says that the sheep he saw were similar to .A. the ones his ancestors had keptB. the ones that lived in his own countryC. those his ancestors had seen at the Cape of Good HopeD. those his ancestors had taken to the Cape of Good Hope60. The author was surprised to hear the calls to prayer because .A. he was far away from the city, yet he could hear them clearlyB. he did not think there would be any callsC. the calls came from the mosquesD. the calls were no different over loud-speakers61. The market has changed in character because now .A. it does sell jewelleryB. the holy men do not sell thereC. it sells goods for tourists and items of little valueD. the traders have disappeared because it is too dangerous to sell therePassage 2The component of the healthy personality that is the first to develop is the sense of trust. As with other personality components, the sense of trust is not something that develops independent of other manifestations of growth. It is not that infants learn how to use their bodies for purposeful movement, learn to recognize people and objects around them, and also develop a sense of trust. Rather, the concept “sense of trust” is a shortcut expression intended to convey the characteristic flavor of all the child‟s satisfying experiences at this early age.Studies of mentally ill individuals and observations of infants who have been grossly deprived of affection suggest that trust is an early-formed and important element in the healthy personality. Psychiatrists find again and again that the most serious illnesses occur in patients who have been sorely neglected or abused or otherwise deprived of love in infancy.Observations of infants brought up in emotionally unfavorable institutions or moved to hospitals with inadequate facilities for psychological care support these findings. A recent report says that “Infants under 5 months of age who have been in an institution for some time present a well-defined picture. The outstanding features are listlessness, relative immobility, quietness, poor sleep, an appearance of unhappiness, etc.”Another investigation of children separated from their mothers at 6 to 12 months and not provided with an adequate substitute comes to much the same conclusion.Most significant for our present point, these reactions are most likely to occur in children who, up to the time of separation at 6 to 9 months of age, had a happy relation with their mothers, while those whose relations were unhappy are relatively unaffected.It is at about this age that the struggle between trusting and mistrusting the world comes to a climax, for it is then that children first perceive clearly that they and their environment are things apart. That at this point formerly happy infants should react so badly to separation suggests, indeed, that they had a faith that now has been shattered. In most primitive societies and in some sections of our own society, the attention accorded infants is more in line with natural processes. Throughout infancy the baby is surrounded by people who are ready to feed it, fondle it, and otherwise comfort it at a moment‟s notice. Moreover, these ministrations are given spontaneously and wholeheartedly, and without that element of nervous concern that may characterize the efforts of young mothers made self-conscious and insecure by our scientific age.We must not exaggerate, however. Most infants in our society too find smiles and comfort. As their own bodies come to be more dependable, there is added to the pleasures of increasing sensory response and motor control the pleasure of the mothers‟ encouragement. Then, too, psychologists tell us that mothers create a sense of trust in their children not by the particular techniques they employ but by the sensitiveness with which they respond to the children‟s needs and by their overall attitude.62. The sense of trust in an infant is under development when .A. the infant experiences some satisfactionB. adults‟ trust is adequateC. the infant learns how to moveD. the infant is surrounded by people he can recognize63. The author raises evidence of mental illness and other disorders in children .A. to introduce a discussion of the effect of institutions on childrenB. to show the effect on children of an unhappy relation with their mothers during infancyC. to warn parents of the dangers of neglecting and abusing their childrenD. to support the point that trust is an early formed and important element of a healthy personality64. Babies might mistrust the world if .A. they did not receive food when they were hungryB. they mastered their body movements too quicklyC. someone came too close to themD. they saw an object disappear65. The climax in the development of a sense of trust occurs .A. before maternal affection is providedB. when a child perceives that he or she is separate from the environmentC. when a child successfully controls his or her muscular coordinationD. as a result of maternal separation66. A possible reason that a child having an unhappy relation with his/her mother will not be affected by maternal separation at 6 to 9 months is that .A. the struggle between trusting and mistrusting has reached a climaxB. the child sees himself/herself as being separate from the environmentC. the child‟s sense of trust is destroyedD. no sense of trust has ever developed67. According to this passage, the most important factor in developing a sense of trust is .A. the type of techniques used by the motherB. the sensitivity of the childC. maternal loveD. the combined effect of natural feeling and cultural attitudes68. How can mothers create a sense of trust in a child?A. By showing confidence and experience in front of the child.B. By applying techniques taught by psychologists.C. By showing the child that the mother is understanding of his/her wants.D. By offering smiles and comforts.Passage 3I saw a television advertisement recently for a new product called an air sanitizer. A woman stood in her kitchen, spraying the empty space in front of her as though using Mace against an imaginary assailant. She appeared very determined. Where others aresatisfied with antibacterial-laced sponges, dish soaps, hand sanitizers and telephone wipes, here was a woman who sought to sterilize the air itself.As a casual student of microbiology, I find it hard to escape the absurdity here. This woman is, like any human being, home to hundreds of trillions of bacteria. Bacteria make up a solid third, by weight, of the contents of her intestines. If you were to sneak into her bathroom while she was showering—and based on my general impression of this woman from the advertisement, I don‟t recommend this—and secret away a teaspoon of the water at her feet, you would find some 820 billion bacteria. Bacteria are unavoidably, inevitably—and, usually, utterly benignly—a part of our world.The fantasy of a germ-free home is not only absurd, but it is also largely pointless. Unless you share your home with someone very old, very young (under 6 months) or very ill, the few hundred bacteria on a countertop, doorknob or spoon pose no threat. The bacteria that cause food poisoning, the only significant rational bacterial worry in the average home, need to multiply into the thousands or millions before they can overwhelm your immune system and cause symptoms.The only way common food poisoning bacteria can manage this is to spend four or five hours reproducing at room temperature in something moist that you then eat. If you are worried about food poisoning, the best defense is the refrigerator. If you don‟t make a habit of eating perishable food that has been left out too long, don‟t worry about bacteria.Viruses are slightly different. You need only pick up a few virus particles to infect yourself with a cold or flu, and virus particles can survive on surfaces for days. So disinfecting the surfaces in the home should, in theory, reduce the chances of picking up a bug.In practice, the issue is less clear. A study by Dr. Elaine Larson at the Columbia School of Nursing called into question the usefulness of antibacterial products for the home. In New York, 224 households, each with at least one preschooler, were randomly assigned to two groups. One group used antibacterial cleaning, laundry and hand-washing products. The other used ordinary products. For 48 weeks, the groups were monitored for seven symptoms of colds, flu and food poisoning—and found to be essentially thesame. A ccording to Dr. Gerba‟s research, an active adult touches an average of 300 surfaces every 30 minutes. You cannot win at this. You will become obsessive-compulsive. Just wash your hands with soap and water a few times a day, and leave it at that.69. What is the main idea of this passage？A. We don‟t need to worry too much about bacteria everywhere in our life.B. Antibacterial products for the home are found to be effective.C. The TV advertisement the writer mentioned is a total failure.D. The existent bacteria pose a threat only to the very young and very old.70. We can infer from Paragraph 3 that .A. healthy people should live separately from unhealthy members of the familyB. a germ-free home is not only possible, but significantC. unless you live with the vulnerable, it is pointless to sterilize the airD. our immune systems are too weak to fight against the food poisoning bacteria71. In the first sentence of Paragraph 4, “... manage this” means “to manage the process of .A. killing the bacteria in your bodyB. multiplying to a significantly large numberC. raising the room temperatureD. sterilizing the perishable food72. According to the author, if you want to keep healthy, you had better .A. make the room dryB. keep the food in the refrigeratorC. wash your hands as much as possibleD. clean the surfaces with anti-bacterial products73. From Paragraph 5 the author emphasizes .A. the danger of virusesB. the common existence of virus particlesC. the short life span of virusesD. the difficulty in killing viruses74. The word “bug” used in Paragraph 5 means .A. a bacteriumB. a coldC. a fluD. a virus75. According to the author, one will become obsessive-compulsive .A. if he washes his hands every time he touches a surfaceB. if he only washes his hands with soap and waterC. if he could not win over the bacteria in his homeD. if he does not fight against the bacteria at homePassage 4Until recently the halls of North High in Minneapolis were lined with vending machines where students could buy soda pop and other sugary drinks, as they can in most other high schools in the nation. But with rates of childhood obesity sky-rocketing, the Minneapolis school district worried about pushing pop. The district needed a way to keep its lucrative vending contract with Coca-Cola while steering kids toward more healthful beverages.Bryan Bass, North‟s assistant principal, took the challenge. He stocked 12 of North‟s 16 vending machines only with water, priced at 75 cents a bottle. Three machines dispensed juice and sports drinks for $1. Only one sold soft drinks, at $1.25 per can. “We located the water machines strategically outside our buildings, so when you come out of a classroom what you see is a water machine,” says Bass. “We also decided to allow water in classrooms but not juice or pop.” The result? Profits from the vending machines nearly tripled, from $ 4,500 to $11,000 in two years. They‟re now in their third year, and says Bass:“Water has become …cool.‟”North‟s suc cess demonstrates what many obesity experts and parents believe: Kids will learn to make healthful food and drink choices if they have access to them and are motivated to do so. “Price is a powerful motivator,” says Simone French of the University of Minnesota, an expert on school-based obesity prevention. She‟s impressed with North‟s efforts, but she says the problem is implementing these strategiesthroughout society. “Obesity is the biggest health issue facing kids,and we‟ve got to do more.”How to do mo re was outlined last week in the Institute of Medicine‟s 460-page action plan, mandated by Congress, on “Preventing Childhood Obesity.” Chaired by Emory University‟s Jeffrey Koplan, the plan is the first comprehensive look at childhood obesity and what government, industry, schools, communities, families, and medical professionals can do to reduce its impact. “I think this is similar in importance to the first Surgeon General‟s Report on Smoking and Health in 1964,” Koplan says. That landmark document led to the health warning on cigarette packages and a ban on cigarette advertising on TV.76. In most American high schools, selling soft drinks is .A. encouragedB. allowedC. unlawfulD. unprofitable77. Water has become “cool” in the Minneapol is school district partly because .A. water is provided freeB. most kids can afford nothing but waterC. water machines are put in noticeable positionsD. children have realized the harm of sugary drinks78. We can infer that in terms of healthful drinks for kids, Simone French and some other experts are .A. confident about children‟s choicesB. pessimistic about the futureC. puzzled about which approach to takeD. worried about how to motivate children79. By mentioning the 1964 report on smoking, Jeffrey Koplan implied that .A. more children tend to smoke today than yesterdayB. both obesity and smoking require the attention of schools and society.C. the present plan on obesity would function similarly as a landmark.D. obesity and smoking are both health problems.80. The primary purpose of this passage is to .。
中科院自动化所博士申请笔试内容
中科院自动化所博士申请笔试内容示例文章篇一：《中科院自动化所博士申请笔试：一场充满挑战与机遇的旅程》我呀，一直都有一个大大的梦想，那就是能在科学的世界里畅游，做一些超级酷的研究。
当我听说中科院自动化所的博士申请的时候，我感觉自己的心就像被点燃了一样。
这就好比在黑暗中看到了一颗超级闪亮的星星，我就想朝着那个方向努力奔跑。
中科院自动化所，那可是一个充满魔力的地方。
我想那里就像一个巨大的科学宝藏库，各种各样的知识和先进的技术就像宝藏一样藏在里面。
而博士申请的笔试呢，就像是打开这个宝藏库的一把重要钥匙。
我有个好朋友叫小明，他也对这个很感兴趣。
有一天，我们俩凑在一起聊这个事儿。
我兴奋地对他说：“小明，你知道吗？中科院自动化所的博士申请笔试，那可是我们离梦想很近的一步呢！”小明眼睛亮晶晶的，他说：“是啊，我感觉那里面肯定都是特别难的题目，就像一道道高高的山峰，等着我们去攀爬。
”我拍拍他的肩膀说：“难是难，可咱们要是征服了这些山峰，那看到的风景肯定超级美！”我开始去了解这个笔试的内容。
哇，这里面的东西可真是五花八门。
有数学知识，那些数学公式就像一个个神秘的魔法咒语。
我在复习数学的时候，就感觉自己像是一个小魔法师在解读古老的魔法书。
一会儿是复杂的微积分，我就想，这微积分就像一个弯弯绕绕的迷宫，我得小心翼翼地找到出口。
还有线性代数，那些矩阵就像一个个小方阵，每个数字都有它独特的位置和意义，我得把它们的关系都搞清楚，就像要指挥一群小士兵一样。
除了数学，还有专业知识呢。
自动化这个领域可太有趣了。
它就像一个超级智能的大机器，有各种各样的零件和原理。
我在学习控制系统的时候，就觉得它像一个精密的钟表。
每个齿轮，也就是每个控制环节，都要紧密配合，才能让整个钟表准确地运行。
我要是想在笔试里表现好，就得把这个“大钟表”的构造和运行原理都摸得透透的。
我又碰到另一个小伙伴，小花。
小花一脸苦恼地对我说：“这笔试的专业知识太多了，我感觉我都要被淹没了。
自动化专业2005级《现代控制理论》考试答案及评分标准
二、 （20 分） （1）如何由一个传递函数来给出其对应的状态空间模型，试简述其解决思路？ （2）给出一个二阶传递函数 G ( s ) =
2s + 5 的两种状态空间实现。 ( s + 3)( s + 5)
解： （1）单输入单输出线性时不变系统传递函数的一般形式是 G ( s) = s n + a n −1 s n −1 + L + a1 s + a 0 bn s n + bn −1 s n −1 L + b1 s + b0
λ2 n
M
⎡ e λ1t ⎤ ⎢ λ2 t ⎥ e ⎥ =⎢ O M ⎥⎢ M ⎥ ⎢ M ⎥ ⎥ ⎥ ⎢ λn t ⎥ −1 ⎢ L λn ⎢e ⎦ ⎥ ⎥ ⎣α n −1 (t )⎦ ⎣ n ⎦
其系数矩阵的行列式是著名的范德蒙行列式，当 λ1 , λ 2 , L , λ n 互不相同时，行列式的值不为零，从 而从方程组可得惟一解 α 0 (t ), α 1 (t ), L , α n −1 (t ) 。由
因此，若采用并联分解方式，则系统的状态空间模型为：
&1 ⎤ ⎡− 3 0 ⎤ ⎡ x1 ⎤ ⎡− 0.5⎤ ⎡x ⎥=⎢ ⎢x ⎥u ⎥⎢ ⎥ + ⎢ ⎣ & 2 ⎦ ⎣ 0 − 5⎦ ⎣ x 2 ⎦ ⎣ 2.5 ⎦ ⎡x ⎤ y = [1 1]⎢ 1 ⎥ ⎣ x2 ⎦
方法三：将 G ( s ) 重新写成下述形式：
G(S ) =
每一个环节的状态空间模型分别为：
−0.5 2.5 + s+3 s+5
&1 = −3x1 − 0.5u ⎧x ⎨ ⎩ y1 = x1
& 2 = −5 x 2 + 2.5u ⎧x ⎨ ⎩ y 2 = x2
2005年博士研究生考试工业催化试题[1]修改
![2005年博士研究生考试工业催化试题[1]修改](https://img.taocdn.com/s3/m/781dd828cfc789eb172dc825.png)
2005年博士研究生入学考试工业催化试题及答案一、名词解释：多相催化－指催化剂与反应物分别处于不同相的催化反应体系，通常为固液相反应或固气相反应，即催化剂为固相，反应物以液态或气态的形式与催化剂接触，从而发生催化反应。
催化剂寿命－是指催化剂从开始使用至它的活性下降到在生产中不能再用的程度（这个程度取决于生产的具体技术经济条件）所经历的时间。
催化助剂－这是催化剂中具有提高主催化剂的活性、选择性，改善催化剂的耐热性、抗毒性、机械强度和寿命等性能的组分。
简言之，在催化剂中只要添加少量助催化剂，即可明显达到改进催化剂催化性能的目的。
助催化剂通常可分为：结构助催化剂、电子助催化剂、晶格缺陷助催化剂和扩散助催化剂。
活性位－催化剂的活性位随不同的催化剂而异，它可以是一个质子，配位络合物，表面原子簇，蛋白质上的胶束囊。
一般以“*”表示。
对固体催化剂而言，它是固体表面的配位不饱和的原子或由这样的原子组成的簇，在一系列的反应步骤中，反应物或中间物能吸附在它的上面。
绿色化学－绿色化学相对于传统化学是更高层次的化学。
它是利用化学的技术和方法去减少或消灭那些对人体健康、社区安全、生态环境有害的原料、催化剂、溶剂和试剂、产物及副产物等的使用和生产。
其主要特点是原子经济性，即在获取新物质的转化过程中充分利用每个原料原子，实现“零排放”，因此可以充分利用资源，又不产生污染。
择形催化－因为分子筛结构中由均匀的小内径，当反应物和产物的分子线度与晶内孔径相接近时，催化反应的选择性常取决于分子与孔径的相应大小。
这种选择性称之为择形催化。
物理吸附和化学吸附－由分子间的作用力即范德华力产生的吸附为物理吸附，一般不具有选择性，即可以发生单分子层吸附，也可以形成多分子层吸附。
由化学键力产生的吸附为化学吸附，具有明显的选择性，只能发生单分子层吸附。
金属的分散度－金属在载体上微细的分散程度用分散度表示，其定义为：D ＝总的金属离子表面的金属离子/克催化剂 固定床反应器－凡是流体经过不动的固体物料所形成的床层而进行反应的装置都称为固定床反应器，其中尤以用气态的反应物料通过由固体催化剂所形成的床层而进行反应的气-固相催化反应器占最主要的地位。
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现代控制理论试卷及答案
现代控制理论试卷一、简答题（对或错，10分）（1）描述系统的状态方程不是唯一的。
（2）用独立变量描述的系统状态向量的维数不是唯一的。
（3）对单输入单输出系统，如果1()C sI A B --存在零极点对消，则系统一定不可控或者不可观测。
（4）对多输入多数出系统，如果1()sI A B --存在零极点对消，则系统一定不可控。
（5）李雅普诺夫直接法的四个判定定理中所述的条件都是充分条件。
（6）李雅普诺夫函数是正定函数，李雅普诺夫稳定性是关于系统平衡状态的稳定性。
（8）线性定常系统经过非奇异线性变换后，系统的可控性不变。
（9）用状态反馈进行系统极点配置可能会改变系统的可观测性。
（10）通过全维状态观测器引入状态反馈来任意配置系统的闭环极点时，要求系统必须同时可控和可观测。
对一个线性定常的单输入单输出5阶系统，假定系统可控可观测，通过设计输出至输入的反馈矩阵H 的参数能任意配置系统的闭环极点。
二、试求下述系统的状态转移矩阵()t Φ和系统状态方程的解x 1(t)和x 2(t)。
（15分）1122()()012()()()230x t x t u t x t x t ⎡⎤⎡⎤⎡⎤⎡⎤=+⎢⎥⎢⎥⎢⎥⎢⎥--⎣⎦⎣⎦⎣⎦⎣⎦12(0)0,(),0(0)1tx u t e t x -⎡⎤⎡⎤==≥⎢⎥⎢⎥⎣⎦⎣⎦ 三、设系统的传递函数为()10()(1)(2)y s u s s s s =++。
试用状态反馈方法，将闭环极点配置在－2，－1＋j ，－1－j 处，并写出闭环系统的动态方程和传递函数。
（15分） 四、已知系统传递函数2()2()43Y s s U s s s +=++，试求系统可观标准型和对角标准型，并画出系统可观标准型的状态变量图。
（15分）五、已知系统的动态方程为[]211010a x x uy b x ⎧⎡⎤⎡⎤=+⎪⎢⎥⎢⎥⎨⎣⎦⎣⎦⎪=⎩，试确定a ，b 值，使系统完全可控、完全可观。
中国科学院(中科院)考博历年试题汇总
6．在非极端环境的生物体中是否存在氰化物不敏感的呼吸作用？如果有，其可能的生
七、酶联免疫吸附实验（ELISA）的基本原理是什么？如何用此方法检测样品中的抗原
华慧网
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自动控制原理试题库20套和答案详解
. 专业资料可编辑 .一、填空（每空1分，共18分）1．自动控制系统的数学模型有 、 、 、共4种。
2．连续控制系统稳定的充分必要条件是 。
离散控制系统稳定的充分必要条件是 。
3．某统控制系统的微分方程为：dtt dc )(+0.5C(t)=2r(t)。
则该系统的闭环传递函数 Φ(s)= ；该系统超调σ%= ；调节时间t s (Δ=2%)= 。
4．某单位反馈系统G(s)=)402.0)(21.0()5(1002+++s s s s ，则该系统是 阶 型系统；其开环放大系数K= 。
5．已知自动控制系统L(ω)曲线为：则该系统开环传递函数G(s)= ；ωC = 。
6．相位滞后校正装置又称为 调节器，其校正作用是 。
7．采样器的作用是 ，某离散控制系统)()1()1()(10210TT e Z Z e Z G -----=（单位反馈T=0.1）当输入r(t)=t 时.该系统稳态误差. 专业资料可编辑 .为 。
二. 1.求图示控制系统的传递函数.求：)()(S R S C （10分）R(s). 专业资料可编辑 .2.求图示系统输出C （Z ）的表达式。
（4分）四．反馈校正系统如图所示（12分）求：（1）K f =0时，系统的ξ，ωn 和在单位斜坡输入下的稳态误差e ss . （2）若使系统ξ=0.707，k f应取何值？单位斜坡输入下e ss .=？T五.已知某系统L（ω）曲线，（12分）（1）写出系统开环传递函数G（s）（2）求其相位裕度γ（3）欲使该系统成为三阶最佳系统.求其K=？，γmax=?. 专业资料可编辑.. 专业资料可编辑 .（1）（2） （3）六、已知控制系统开环频率特性曲线如图示。
P 为开环右极点个数。
г为积分环节个数。
判别系. 专业资料可编辑 .七、已知控制系统的传递函数为)1005.0)(105.0(10)(0++=s s s G 将其教正为二阶最佳系统，求校正装置的传递函数G 0（S ）。
现代控制理论试卷答案3套
现代控制理论试卷 1一、(10分)判断以下结论，若是正确的，则在括号里打√，反之打×(1)用独立变量描述的系统状态向量的维数是唯一。
（）(2)线性定常系统经过非奇异线性变换后，系统的能观性不变。
（）(3)若一个系统是李雅普诺夫意义下稳定的，则该系统在任意平衡状态处都是稳定的。
（）(4)状态反馈不改变被控系统的能控性和能观测性。
（）(5)通过全维状态观测器引入状态反馈来任意配置系统的闭环极点时，要求系统必须同时能控和能观的。
（）二、（12分）已知系统1001010,(0)00121x x x⎛⎫⎛⎫⎪ ⎪==⎪ ⎪⎪ ⎪⎝⎭⎝⎭，求()x t.三、(12分) 考虑由下式确定的系统：2s+2(s)=43Ws s++，求其状态空间实现的能控标准型和对角线标准型。
四、（9分）已知系统[]210020,011003x x y⎡⎤⎢⎥==⎢⎥⎢⎥-⎣⎦，判定该系统是否完全能观？五、(17分) 判断下列系统的能控性、能观性；叙述李亚普诺夫稳定性的充要条件并分析下面系统的稳定性.[]xy u x x 11103211=⎥⎦⎤⎢⎣⎡+⎥⎦⎤⎢⎣⎡--=六、（17分）已知子系统1∑ 111121011x x u -⎡⎤⎡⎤=+⎢⎥⎢⎥-⎣⎦⎣⎦，[]1110y x = 2∑ []22222110,01011x x u y x -⎡⎤⎡⎤=+=⎢⎥⎢⎥-⎣⎦⎣⎦求出串联后系统的状态模型和传递函数.七、（15分）确定使系统2001020240021a x x u b -⎡⎤⎡⎤⎢⎥⎢⎥=-+⎢⎥⎢⎥⎢⎥⎢⎥-⎣⎦⎣⎦为完全能控时，待定参数的取值范围。
八、（8分）已知非线性系统 ⎩⎨⎧--=+-=2112211sin 2x a x xx x x试求系统的平衡点，并确定出可以保证系统大范围渐近稳定的1a 的范围。
现代控制理论 试卷 1参考答案一、(10分)判断以下结论，若是正确的，则在括号里打√，反之打× (1) 用独立变量描述的系统状态向量的维数是唯一。
(完整版)现代控制理论试卷答案与解析
现代控制理论试卷作业一．图为R-L-C电路，设u为控制量，电感L上的支路电流11121222121212010Y xUR R R RY xR R R R R R⎡⎤⎡⎤⎡⎤⎡⎤⎢⎥⎢⎥=+⎢⎥⎢⎥⎢⎥⎢⎥-⎣⎦⎣⎦+++⎢⎥⎢⎥⎣⎦⎣⎦和电容C上的电压2x为状态变量，电容C上的电压2x为输出量，试求：网络的状态方程和输出方程（注意指明参考方向）。
解：此电路没有纯电容回路，也没有纯电感电路，因有两个储能元件，故有独立变量。
以电感L上的电流和电容两端的电压为状态变量，即令：12,L ci x u x==，由基尔霍夫电压定律可得电压方程为：2221R C x x L x••+-=1121()0R x C x L x u••++-=从上述两式可解出1x•，2x•，即可得到状态空间表达式如下：121121212()()R Rx R R LRxR R C••⎡-⎡⎤⎢+⎢⎥⎢=⎢⎥⎢-⎣⎦⎢+⎣121121221212()()11()()R RxR R L R R LuxR R C R R C⎤⎡⎤⎥⎢⎥++⎡⎤⎥⎢⎥+⎢⎥⎥⎢⎥⎣⎦-⎥⎢⎥++⎦⎣⎦⎥⎦⎤⎢⎣⎡21yy=⎥⎥⎦⎤⎢⎢⎣⎡++-21121211RRRRRRR⎥⎦⎤⎢⎣⎡21xx+uRRR⎥⎥⎦⎤⎢⎢⎣⎡+212二、考虑下列系统：（a）给出这个系统状态变量的实现；（b）可以选出参数K（或a）的某个值，使得这个实现或者丧失能控性，或者丧失能观性，或者同时消失。
解：（a）模拟结构图如下：13123312312321332133x u kx xx u kxx x x axy x x•••=--=-=+-=+则可得系统的状态空间表达式：123xxx•••⎡⎤⎢⎥⎢⎥=⎢⎥⎢⎥⎢⎥⎣⎦32-⎡⎢⎢⎢⎣112311xkk x ua x-⎡⎤⎤⎡⎤⎢⎥⎥⎢⎥-+⎢⎥⎥⎢⎥⎢⎥⎥⎢⎥-⎦⎣⎦⎣⎦[2y=1]123xxx⎡⎤⎢⎥⎢⎥⎢⎥⎣⎦（b ） 因为 3023A -⎡⎢=⎢⎢⎣ 001 k k a -⎤⎥-⎥⎥-⎦ 110b ⎡⎤⎢⎥=⎢⎥⎢⎥⎣⎦302Ab -⎡⎢=⎢⎢⎣ 0013 k k a -⎤⎥-⎥⎥-⎦131001-⎡⎤⎡⎤⎢⎥⎢⎥=⎢⎥⎢⎥⎢⎥⎢⎥⎣⎦⎣⎦ 23023A b -⎡⎢=⎢⎢⎣ 0013 k k a -⎤⎥-⎥⎥-⎦301-⎡⎤⎢⎥⎢⎥⎢⎥⎣⎦92k k a -⎡⎤⎢⎥=-⎢⎥⎢⎥--⎣⎦ [M b = Ab 2110A b ⎡⎢⎤=⎦⎢⎢⎣ 301- 91020k k a -⎤⎡⎥⎢-→⎥⎢⎥⎢--⎦⎣ 010 31k a -⎤⎥-⎥⎥-⎦所以：当1a =时，该系统不能控；当1a ≠时，该系统能控。
北京理工大学2005年《自动控制理论》考研真题、答案与解析
1−ζ 2
≤16.3% ，应有 ζ ≥0.5 。
5
网学天地（）
过坐标原点做与负实轴夹角为 60° 的直线，交根轨迹于 A 点。 设 A 点坐标为 (σ ，ω ) ，显然 ω = − 3σ 。代入特征方程 s 2 + 2 s + 10 + 10 K t s = 0 ，得：
移动。 三、解： （1）依题意得：
f ( s, λ ) = (1 − λ ) f1 ( s ) + λ f 2 ( s ) = (1 − λ ) ( s 3 + 6 s 2 + 12s + 8 ) + λ ( s 3 + 3s 2 + 4 s + 2 )
= s 3 + ( 6 − 3λ ) s 2 + (12 − 8λ ) s + 8 − 6λ
3
8 s2 + s + 2 3 s =0
=3
此时， λ = 1 ，当 0≤λ≤1 时，由根轨迹可知， f ( s, λ ) 均稳定。 四、解： （1）系统开环脉冲传递函数：
⎡1 − e −Ts 5 ⎤ −1 G(z) = Ζ ⎢ ⋅ ⎥ = 5 (1 − z ) Ζ 1 + s s s ( )⎦ ⎢ ⎥ ⎣ ⎡ ⎤ 1 −1 ⎢ 2 ⎥ = 5 (1 − z ) Ζ 1 + s s )⎦ ⎢ ( ⎥ ⎣ 1 ⎤ ⎡1 1 ⎢ s 2 − s + s + 1⎥ ⎣ ⎦
ωc ω ω − arctan c − arctan c ω1 ω2 ω3
当 ωc /ω1 = 100 ， ωc /ω2 = 2 ， ωc /ω3 = 0.1 时， γ = 20.28° 此时闭环系统稳定。