2017年西安电子科技大学845工业设计综合考研真题考研试题硕士研究生入学考试试题
西安电子科技大学研究生期末考试英语试题
西安电子科技大学研究生期末考试英语试题西安电子科技大学研究生课程考试试题（答案必须写在答题纸上或在答题卡上填涂）考试科目：英语基础课程编号：0821001考试日期：12 年6 月25 日考试时间：150 分考试方式：(闭卷) 任课教师：班号学生姓名：学号：考生注意事项一、本试卷由两份试卷组成：试卷一( Paper One ) 包括词汇，完形填空,与阅读理解三部分，共60题，按顺序统一编号；试卷二( Paper T wo ) 包括翻译与写作两部份，共3题。
二、试卷一（题号1－60）为客观评分题，答案一律用中性(HB)铅笔做在机读答题纸上，在对应题号下所选的字母中间划黑道，如[A] [B][C][D]。
三、试卷二为主观评分题，答案分别做在ANSWER SHEETⅡ上。
试卷一(Paper One)PartⅠ VOCABULARY (20 points)Section A: (1 point each)Directions: There are ten sentences in this section. Each sentence has one word or a set of words underlined. Below the sentence are fourwords or phrases marked A, B, C and D. Choose the word or phrase that is closest in meaning to the underlined one. Mark thecorresponding letter with a single bar across the squarebracketson your machine-scoring Answer Sheet.1. But while it may be interesting for foreigners such as the US banker to look at the Nordic model, it appears difficult to emulate it.A. intimateB. intimidateC. imitateD. intimacy2. In the inception phase, the product idea or request for proposal is developed to the point that the funding decision can be made.A. perceptionB. beginningC. inclinationD. deception3. The official said the company was looking for access to capital to make itless vulnerable to competitors and takeover bids.A. defenselessB. vagueC. temptD. vulgar4. Now he owned the state’s largest advertising agency and was a veterandirector of the bank with strong influence on the board.A. prestigiousB. necessaryC. irreplaceableD. experienced5. So the court says it is important that the trademark proprietors should not beallowed to hold a perpetual monopoly on technical solutions.A. everlastingB. temporaryC. prolongD. prevailing6. The paper is entitled: Research on the Formation of Information Technology Usage Habituation from the Automatic Goal-Directed Behavior Perspective.A. justificationB. habitC. derivationD. adaptation7. Economists, however, are doing their best to gauge just how much thedestruction will cost both Japan and the world in economic growth.A. evacuateB. evaluateC. evaporateD. consume8. Meanwhile, despite all the crackdowns and criminal penalties, melamine (三聚氰胺) continues to pop up in the country’s dairy supply.A. pump upB. go quicklyC. appear suddenlyD. are frantic with9. The study was not designed to answer why sleeping longermay bedeleterious or whether people could extend their life span by sleeping less.A. neutralB. harmfulC. positiveD. negative10.A group of ladies saunter down a road in Skegness wearing floral, collaredshirts and closed toe shoes.A. scamperB. scraperC. strollD. scootSection B (1 point each)Directions: There are ten sentences in this section. Each sentence has something omitted. Choose the word or words from the fourchoices given to best complete each sentence. Mark thecorresponding letter with a single bar across the square bracketson your machine-scoring Answer Sheet.11. She suggests taking a methodical approach to individuals you are cominginto with, dividing them up under several headings, or markets.A. beingB. useC. contactD. action12. But I am guilty of an entirely different form of multitasking: in any givenmonth, I have lots of projects on the .A. moveB. courseC. pathD. go13. I really don’t see why our English teacher our monitor for praisesince we have all done quite well this term.A. leaves outB. singles outC. trips upD. provoked up14. There may be many providers for the service, and each of them may have adifferent name for the service or some other non-standard requirementsthat the service requester must .A. abide byB. abuse byC. bet byD. abandoned by15. V erify that the version of Microsoft Exchange you are using is withthe database version that you are trying to mount.A. competitiveB. contradictC. compatibleD. indifferent16. I think, learning English can three simple ingredients: persistence,proper ways and good teachers.A. boil down toB. in terms ofC. accord toD. be regarded to17. He eventually built a new, highly automated big factory that does nothingbut the plastic stoppers, 157 million a month.A. chuck outB. check outC. put outD. churn out18.Let others make their employees’ cuts first in the hope that they willattention you.A. deflect…fromB. depart….fromC. convert….fromD. derive…from19. Technologies can a powerful influence the lifelonglearning process, as well as to help overcome various inequalities in society.A. execute….onB. excurse…onC. exert…onD. exculpate…on20. The two animals each other in their eagerness to get inside, andheard the door shut behind them with great joy and relief.A. mussed overB. tumbled overC. came overD. slashed overPart Ⅱ CLOZE TEST ( 10 points)Directions: Read the passage through. Then go back and choose one item of suitable word(s) marked A, B, C and D for each blank in thepassage. Mark the corresponding letter of the word(s) you havechosen with a single bar across the square brackets on your machine-scoring Answer Sheet.For the past two years, I have been working on students’evaluation of classroom teaching. I have kept a record of informal conversations 21 some 300 students from at 22 twenty-one colleges and universities. The students were generally frank and direct in their comments 23 how course work could be better presented. Most of their remarks were kindly made with tolerance rather than bitterness----and frequently were softened by the fact that the students were speaking about some, not all, instructors. Nevertheless, 24 the following suggestions and comments indicate, students feel 25 with things as they are in the classroom.Professors should be 26 from reading lecture notes. “It makes their voices monotonous.”If they are going to read, why not 27 out copies of the lecture? Then we wouldn’t need to go to class. Professors should 28 repeating in lectures material that is in the textbook. “29 we’ve read the material, we want to discuss it or hear it elaborated on,30 repeated.”“A lo t of students hate to buy a required text that the professor has written only to have his lectures repeat it.”21. A. counting B. covering C. figuring D. involving22. A. best B. length C. least D. large23. A. at B. on C. of D. over24. A. if B. though C. as D. whether25. A. satisfactory B. unsatisfactory C. satisfied D. dissatisfied26. A. interfered B. discouraged C. disturbed D. interrupted27. A. hold B. give C. drop D. leave28. A. avoid B. prevent C. refuse D. prohibit29. A. Until B. Unless C. Once D. However30. A. not B. or C. and D. yetPart ⅢREADING COMPREHENSION ( 30 points)Directions: In this part of the tests, there are six short passages for you to read. Read the passage carefully, and then answer the questionsthat follow. Then choose the best answer from the chioces markedA, B, C and D, and mark the corresponding letter with a single bar across the square brackets on your machine-scoring AnswerSheet.Passage OneThe e-book, you could argue, is environmentally friendly, which is true, but it is also incredibly counter-intuitive. Computer engineers spend a lot of their time coming up with ways to make computers ubiquitous (无所不在的) in consumer lives, and they’ve largely succeeded in that, which is part of the point. Many consumers have also been busy rejecting electronic banking, partly because we want a few tangible experiences leftin our lives, and handling money is one of those experiences. Reading a book, in a way, is an act of rebellion today. It’s a statement that despite the 35 channels coming in on the cable box, the billions of Web sites and other diversions, you’re going to read a book. This is something someone could have done in the 16th century, when the first books were printed in English.I used to attend a regular “salon”in Man hattan, where Internet people would meet, have dinner and discuss the latest trends. One of the sponsors of these social gatherings, who worked for a publisher, brought an e-book to the group, and passed it around. Everything about it bugged me; it w as characterless, flat and soulless. One might imagine reading the works of Bill Gates on it, but the thought of reading Thackeray or Dickens or Wilkie Collins or even John Steinbeck on it is a laughing matter.In other words, books are more than just words, they have —or used to have —decorative covers, because they are expressions of the author’s creativity. That’s why some people collect first editions. They want to own the book that was authorized by the writer, an edition he or she might have owned. As books age, they attain a certain patina (古色古香), reminding of the history the object has seen.31. According to the author, one drawback of computers is that .A. they require sophisticated computer literacyB. they arc interfering with our private livesC. they can be used only in a limited numbers of areasD. they deprive us of experiences of handling things32. Today, reading books is regarded as .A. creativeB. harmfulC. intellectualD. old-fashioned33. It is the author’s opinion that .A. it is ridiculous to read literary works on an e-bookB. readers find it odd to read Bill Gates’ works on an e-bookC. reading e-books is not very different from reading paper booksD. e-books will replace traditional books in the foreseeable future34. The last paragraph is mainly concerned with the ________ aspect of paperbooks.A. physicalB. intellectualC. estheticD. historical35. What is the author’s main purpose?A. To forecast the e-books’ future.B. To make a case against e-books.C. To suggest alternatives to printed books.D. To weigh the pro and con of e-books.Passage 2Of all the areas of learning, the most important is the development of attitudes. Emotional reactions as well as logical thought processes affect the behavior of most people.“The burnt child fears the fire”is one instance; another is the rise of despots (暴君) like Hitler. Both these examples also point up the fact that attitudes stem from experience. In the one case the experience was direct and impressive; in the other it wasindirect and cumulative. The Nazis were indoctrinated largely by the speeches they heard and the books they read.The classroom teacher in the elementary school is in a strategic position to influence attitudes.This is true partly because children acquire attitudes from those adults whose word they respect.Another reason it is true is that pupils often delve (挖掘)somewhat deeply into a subject in school that has only been touched upon at home or has possibly never occurred to them before. To a child who had previously acquired little knowledge of Mexico, his teacher’s method of handling such a suit would greatly affect his attitude toward Mexicans.The media through which the teacher can develop wholesome attitudes are innumerable. Social studies (with special reference to races, creeds and nationalities), science matters of health and safety, the atmosphere of the classroom…these are a few of the fertile fields for the inculcation of properemotional reactions.However, when children come to school with undesirable attitudes, it is unwise for the teacher to attempt to change their feelings by scolding them. She can achieve the proper effect by helping them obtain constructive experiences.To illustrate, first-grade pupils afraid of policemen will probably alter their attitudes after a classroom chat with the neighborhood officer in which he explains how he protects them. In the same way, a class of older children can develop attitudes through discussion, research, outside reading and all-day trips.Finally, a teacher must constantly evaluate her own attitudes, because her influence can be deleterious if she has personalprejudices. This is especially true in respect to controversial issues and questions on which children should be encouraged to reach their own decisions as a result of objective analysis of all the facts.36. The central idea conveyed in the above passage is that _______.A. attitudes affect our actionsB. teachers play a significant role in developing or changing pupils’attitudesC. attitudes can be changed by some classroom experiencesD. by their attitudes, teachers inadvertently affect pupils’ attitudes.37. A statement not made of implied in the passage is that _______.A.attitudes can be based on the learning of falsehoodsB. a child can develop in the classroom an attitude about the importanceof brushing his teethC.attitudes cannot easily be changed by rewards and lecturesD.the attitudes of elementary school-aged children are influencedprimarily by the way they were treated as infants38. The passage specifically states that _______.A.direct experiences are more valuable than indirect onesB.whatever attitudes a child learns in school have already beenintroduced at homeC.teachers should always conceal their own attitudes.D.Teachers can sometimes have an unwholesome influence on children39. The first and fourth paragraphs have all the following points in commonexcept _______.A.the importance of experience in building attitudesB.how fear sometimes governs attitudesC.how attitudes can be changed in the classroomD.how reading affects attitudes40. In the second paragraph, a substitute quotation to serve the writer’spurpose would be: _______.A.“poverty is the parent of revolution and crime.”B.“He that hath wife and children hath given hostages to fortune.C.“There is a great difference between a cunning man and a wise man.”D.“Nothing on earth consumes a man more quickly than the passion ofresentment.”Passage 3The world is undergoing tremendous changes. The rise of globalization, both economic and cultural that has swept throughout the world, has forged new ground as we enter the 21st century. But are the effects of globalization always positive? Some say no.Michael Tenet, head of the International Institute for Foreign Relations in Atlanta, is worried about current resentment throughout the world toward the rise of globalization. “Ever since the 1980s and the economic breakdown of the Asian Tigers in the late 1990s, there has been a re-evaluation of the role of globalization as a for ce for good,” he said, “Income in manycountries has declined and the gap between the most rich and the most poor has been worsened. Without further interference by governments, we could see a tragedy expressed in an increased level of poverty throughout t he Latin America and Asia.”Y et George Frank, an influential economist who works on Wall Street, sees no such danger. “E conomic liberation, increased transparency and market-based reforms have positive effect in the long run, even if market mechanism can produce short term destabilization problems,” he said. “What is most important is that barriers to trade continue to fall so that active competition for consumer goods reduces prices and in turn raises the average level of income.”Others feel that global ization’s cultural impact may be more important than its economic implications. Janice Y awee, a native of Africa, feels strongly that globalization is weakening her local culture and language. “Most of the world’s dialects will become extinct under globalization. We are paving the world with McDonald’s and English slang. It tears me up inside,” she said.However, ignoring the political dimensions of globalization has already had its cost. Nowhere was this made clearer than in the East Asian economic crisis of the late 1990s —particularly in Indonesia. In the wake of that crisis, the President Suharto’s regime was overthrown, and the entire country has been thrown into a mess. The Indonesian economy has contracted almost 50 percent, throwing tens of millions of people below the poverty line.Governments of different countries have had mixed responses to the wave of globalization. The United States is generally seen as an active proponent of greater free trade, andit certainly has enormous cultural influence by virtue of its near monopoly on worldwide entertainment. But other countries, most notably in Europe and developing nations, have sought to reduce the impact that globalization has on their domestic affairs.41. It can be inferred that Michael Tenor’s at titude toward globalization isprobably .A. strongly opposedB. cautiously agreedC. somewhat anxiousD. absolutely supportive42. According to the passage, George Frank .A. agrees with the comments made by Michael TenetB. consents the globalization is favorable to economyC. believes that the reduction of prices is due to the competitionD. thinks the instability is caused by the economic liberalization43. The words by Janice Y awee mean that .A. dialects need more protection by people in the worldB. informal English words are as popular as the McDonald's in the worldC. Janice Y awee’s local culture has vanished in the worldD. the impacts of globalization are great on cultures of the world44. The author cites the example of Indonesia in order to .A. prove the impact of globalization on the field of politicsB. show the economic crisis of the late 1990s in East AsiaC. support the successful economic and political reform in IndonesiaD. illustrate why the Suhatro’s regime collapsed45. This passage implies that .A. globalization is good for a country’s economic developmentB. globalization is widely accepted and advocated by peopleC. globalization is too influential on a country’s economy to be acceptedD. globalization is not always of great benef it to a country’s developmentPassage 4Some futurologists have assumed that the vast upsurge of women in the workforce may portend a rejection of marriage. Many women, according to this hypothesis, would rather work than marry. The converse of this concern is that the prospects of becoming a multi-paycheck household could encourage marriage. In the past, only the earnings and financial prospects of the man counted in the marriage decision. Now, however, the earning ability of a woman can make her more attractive as a marriage partner. Data shows that economic downturns tend to postpone marriage because the parties cannot afford to establish a family or are concerned about rainy days ahead. As the economy rebound, the number of marriages also rises.Coincident with the increasing women working outside the home is the increase in divorce rates. Y et, it may be wrong to jump to reply simple cause-and-effect conclusions. The impact of a wife’s work on divorce is no less cloudy than its impact on marriage decisions. The realization that she can be a good provider may increase the chances that a working wife will choose divorce over an unsatisfactory marriage. But the reverse is equally plausible. Tensions grounded in financial problemsoften play a key role in ending a marriage. Given high unemployment, inflationary problems, and slow growth in real earnings, a working wife can increase household income and relieve some of these pressing financial burdens. By raising family’s standard of living, a working wife may strengthen her family’s financial and emotional stability.Psychological factors also should be considered. For example, a wife blocked from a career outside the home may feel caged in the house. She may view her only choice as seeking a divorce. On the other hand, if she can find fulfillment through work outside the home, work and marriage can go together to create a stronger and more stable union.Also a major part of women’s inequality in marriage has been due to the fact that in most cases, men have remained the main breadwinner. With higher earning capacity and status occupations outside the home comes the capacity to exercise power, within the family. A working wife may rob a husband of being the master of the house. Depending upon how the couple reacts to these new conditions, it could create a stronger equal partnership or it could create new insecurities.46. The word “portend” in P aragraph 1 is closest in meaning to “________”.A. defyB. signalC. suffer fromD. result from47. It is said in the passage that when the economy slides, .A. men would choose working women as their marriage partnersB. more women would get married to seek financial securityC. even working women would worry about their marriagesD. more people would prefer to remain single for the time being48. One reason why women with no career may seek a divorce is that _ .A. they feel that they have been robbed of their freedomB. they are afraid of being bossed around by their husbandsC. they feel that their partners fall to live up to their expectationsD. they tend to suspect their husbands' loyalty to their marriage49. If women find fulfillment through work outside the home, .A. they are more likely to dominate their marriage partnersB. their husbands are expected to do more houseworkC. their marriage ties can be strengthenedD. they tend to put their career before marriage50. Which of the following statements can best summarize the author’s viewin the passage?A. The stability of marriage and the divorce rate may reflect the economicsituation of the country.B. Even when economically independent, most women have to strugglefor real equality in marriage.C. In order to secure their marriage, women should work outside the homeand remain independent.D. The impact of the growing female workforce on marriagevaries fromcase to case.Passage 5In evolutionary terms, humans are relative newcomers to earth, but in a short time they have established themselves as the most successful and dominant species. As Carl Sagan has commented, humans arrived late in December if we consider evolutionary time in terms of a calendar year. As our earliest ancestors left the forest to feed in the savannas and finally to form hunting societies on the open plains, their minds and behavior changed.The theory of natural selection provides an explanation of the evolutionary process. This theory is based on Charles Darwin’s observations of many animal species around the world. Darwin pointed out that organisms reproduce at rates that could lead to enormous increases in population sizes of most species.However, despite these massive reproductive capacities, population size tends to remain fairly constant.Darwin stressed that there is extensive variability-sometimes referred to as genetic diversity-among individuals in a species. Some of these variations appear advantageous for survival. Darwin argued that individuals characterized by these beneficial characteristics would be more likely to survive and succeed in reproducing themselves. Gradually, the organisms with the favorable characteristics would comprise a greater proportion of the population, and over a long period of time, the reproductive advantage could produce a gradual modification of the whole population. However, if environmental conditions change, new sets of characteristics might be favored and the whole process could move off in a different direction.Evolution proceeds at a very slow pace indeed. For example, the lines leading to the emergence of human beings and the great apes began to diverge about 14 million years ago. Modern man came into existence about 50, 000 years ago. The beginning of civilization as we know it began about 10, 000 years ago. In the ensuring years there have been no sweeping evolutionary changes in humans. This is not surprising because we have existed for only about 50, 000 years and it takes much longer fora mammalian species to develop.51. Which of the following statements is certain?A. Humans emerged later than most animals on earth.B. Humans came into existence when the earth was cold.C. Humans became hunters 10,000 years ago.D. No evolution has taken place in humans in the last 10,000 years.52. Why does population size remain relatively constant?A. Organisms do not reproduce at high enough rates.B. Few organisms are characterized with favorable characteristics.C. Some variations in a species fail to survive.D. Evolution takes a longer time than could be imaged.53. According to Darwin, evolution is chiefly determined by _______.A. biological factorsB. environmental factorsC. interspecies factorsD. reproduction time54. The word “diverge” in paragraph 4 is closest in meaning to “__”A. renderB. corruptC. deviateD. derive55. Evolution in a species often starts_______.A. collectivelyB. in some individualsC. suddenlyD. in a sweeping mannerPassage 6Mass production, the defining characteristic of the Second Wave economy, becomes increasingly obsolete as firms install information intens ive, often robotized manufacturing systems capable of endless deep variation, even customization, The revolutionary result is, in effect, the de-massification of mass production.The shift toward smart flex-techs promotes diversity and feeds consumer choice to the point that a Wal-Mart store can offer the buyer nearly 110,000 products in various types, sizes, models and colors to choose among.But Wal-Mart is a mass merchandiser. Increasingly, the mass market itself is breaking up into differentiated niches as customer needs diverge and better information makes it possible for businesses to identify and serve micro-markets. Specialty stores, boutiques, superstores, TV home-shopping systems, computer-based buying, direct mail and other systems provide a growing diversity of channels through which producers can distribute their wares to customers in an increasingly de-massified marketplace. When we wrote Future Shock in the late1960s, visionary marketers began talking about “market segmentation.”Today they no longer focus on “segments”buton “particles”—family units and even single individuals.Meanwhile, advertising is targeted at smaller and smaller market segments reached through increasingly de-massified media. The dramatic breakup of mass audiences is underscored by the crisis of the once great TV networks, ABC, CBS and NBC, at a time when Tele-Communications, Inc. of Denver, announces a fiber-optic network capable of providing viewers with five hundred interactive channels of television. Such systems mean that sellers will be able to target buyers with even greater precision. The simultaneous de-massification of production, distribution and communication revolutionizes the economy and shifts it from homogeneity toward extreme heterogeneity.56. What would be a proper title for this passage?A. Future ShockB. De-massificationC. Changing TrendD. Market Segmentation57. Which is true about “mass production” according to the author?A. It promotes further development in manufacturing systems.B. It defines the Second Wave economy and will last.C. It involves intensive information, automation, and customization.D. It is becoming dated for the present economy.58. The author calls those marketers “visionary” mainly because_______.A. they began talking about “market segmentation” in 1960s.B. they focus on “market particles.”。
西安电子科技大学 2009年攻读硕士学位研究生入学考试试题
西安电子科技大学2009年攻读硕士学位研究生入学考试试题考试科目代码及名称822电磁场与微波技术考试时间2009年 1月 10日下午（ 3小时）答题要求：所有答案〈填空题按照标号写〉必须写在答题纸上，写在试卷上一律作废，准考证号写在指定位置!一、（15分） z=0平面将无限大空间分为两个区域:z<0区域为空气，z>0区域为相对磁导率μr =1，相对介电常数εr =4的理想介质，若知空气中的电场强度为14x z E a a =+V/m ，试求:（1）理想介质中的电场强度E 2;（2）理想介质中电位移矢量D 2与界面间的夹角α;（3） z=0平面上的极化面电荷密度ρsp .二、（15分）均匀平面电磁波在相对磁导率μr =1的理想介质中传播，其电场强度的瞬时值为88(,)5sin[2(10)]5cos[2(10)]x v E r t a t z a t z ππ=-+-（mV/m ），试求：（1）该理想介质的相对介电常数εr ;（2）平面电磁波在该理想介质中的相速度V p ;（3）平面电磁波的极化状态。
三、（15分）空气中传播着磁场复矢量振幅(0.80.6)1()(34)12j x z x z H r a a e ππ-+=-mA/m ，的均匀平面电磁波，试求：（1）该平面电磁波的波长λ；（2）该平面电磁波传播方向的单位矢n ；（3）该平面电磁波电场的复振幅矢量 E®。
四、（15分）电场强度复振幅矢量2()24j z i x E r a e ππ-=（mA/m ）的均匀平面电磁波由空气垂直入射到相对介电常数εr =2.25，相对磁导率μr =1的半无限大理想介质的界面（z=0平面），试求:（1）反射波电场强度的振幅E rm ；（2）反射波磁场的复振幅矢量H r (r)；（3）透射波电场的复振幅矢量E t (r)。
五、（20分）己知无耗传输线电长度为θ，特性阻抗Z 0=1。
第五题用图（a ）（1）已知负载阻抗L l l Z r jx =+，求负载驻波比ρL ；（2）求输入驻波比ρin ；（3）求负载反射系数ΓL 。
浙江工商大学2017考研真题之845计算机基础综合
浙江工商大学2017 年全国硕士研究生入学考试试卷（A ）卷考试科目：845 计算机基础综合总分：150 分考试时间：3 小时第I 部分数据结构（75 分〉一、简答题（每小题7 分，共42 分）1. 有一份电文中共使用五种字符：a,b,c,d,e ，它们的出现频率依次为15, 18, 16, 13, 110，请画出对应的编码赫夫曼树（请按照左子树根结点的权小于等于右子树根结点的权的次序构造），并求出该树的带权路径长度。
2. 已知一棵二叉树的前序和中序序列，建立该二叉树，并求该二叉树的后序序列。
前序序列：8, 6, 3, 1. 2, 5, 4, 9, 7中序序列：1, 2, 3, 4, 5, 6, 8, 7, 93. 给定表（23 ，”，42，”，78, 95, 22, 35 ），请将表调整成初始最大堆。
4 .请描述克鲁斯卡尔（K ruskal ）构造最小生成树算法。
5. 设一数列的输入顺序，为1234 ，若采用堆枝结构，试问通过入出挽操作，能否得到合法序列3241 ，如果能，则给出得到这个序列相应的push 和pop 操作。
6. 阅读下列程序，说明该函数实现了，什么功能。
若原单链表中数据结点的值按顺序分别为1,3,6,4, 2,S ，调用该函数后，结点值有何变化？typedef struct node{int data;st俨uct node *next ;}:struct node ＊手u nc(st r、u c t node *head )struct node *middle,*tail,*lead ;tail = middle = NUL L;lead = head;while ( lead )｛midd le = lead ;lead = lead -> next ;midd le- > next = tail;tail= midd l e;ret u俨n middle;｝二、程序设计〈共33 分〉1. ( 12 分）若以单链表作为存储结构，编写一算法，删除该线性表中所有大于a 且小于b的元素（若表中存在这样的元素）同时释放被删除结点空间，假设线性表中的元素按递增有序排列。
840物理光学-电子科技大学2015硕士入学考试真题
电子科技大学2015年攻读硕士学位研究生入学考试试题电子科技大学2016年硕士研究生入学考试初试自命题科目及代码汇总•111单独考试政治理论•241法语(二外)•242德语(二外)•243日语(二外)•244英语(二外仅日语方向) •288单独考试英语•601数学分析•602高等数学•613分子生物学•615日语水平测试•616公共管理综合•621英语水平测试•622心理学综合•623新闻传播理论•625宪法学•688单独考试高等数学•689西方行政史•690中国近现代史•691政治学原理•692数学物理基础•694生物学综合•694生物学综合•695口腔综合•804行政法与行政诉讼法学•805新闻传播实务•806行政管理综合•808金融学基础•809管理学原理•811大学物理•812地理信息系统基础•813电磁场与电磁波•814电力电子技术•815电路分析基础•818固体物理•820计算机专业基础•821经济学基础•824理论力学•825密码学基础与网络安全•830数字图像处理•831通信与信号系统•832微电子器件•834物理化学•835线性代数•836信号与系统和数字电路•839自动控制原理•840物理光学•845英美文学基础知识及运用•846英语语言学基础知识及运用•847日语专业基础知识及应用•852近代物理基础•853细胞生物学•854国际政治学•855辩证唯物主义和历史唯物主义•856测控通信原理•857概率论与数理统计•858信号与系统•859测控通信基础•860软件工程学科基础综合电子科技大学2015年攻读硕士学位研究生入学考试试题考试科目：840 物理光学注：所有答案必须写在答题纸上，写在试卷或草稿纸上均无效。
一、选择题（每小题3分、共60分）1.可以用复振幅表示光波的条件是。
A. 线性运算B. 非线性运算C. 单色光D. 复色光2. 部分偏振光可以表示为。
A. 两正交线偏振光的叠加B. 线偏振光和圆偏振光的叠加C. 线偏振光和自然光的叠加D. 线偏振光和椭圆偏振光的叠加3. 自然光正入射到界面，其反射光为。
西安电子科技大学硕士研究生入学考试试题(含答案)
也可利用不进位乘法或列表法计算。 11、已知 H ( s ) 的零极点分布图如下图所示，单位冲激响应 h(t ) 的初始值 h(0 ) = 2 ，则该 系统的系统函数 H (s) = 。
+
jω
×
j2
2 σ
−j2
−2 ×
解：由零极点分布图可写出
s →∞
H ( s) =
H 0 ( s − 2) ( s + 2) 2 + 4
对应原函数为
−3 1 −1 1 × = + ， − 1 < Re[ s ] < 2 s − 2 s +1 s − 2 s +1
e2 t ε (−t ) + e − t ε (t )
3 1 1 1 × = ， Re[ s ] > 2 s − 2 s +1 s − 2 s +1
−t
3e 2t ε (t ) ∗ e − t ε (t ) ↔
5
π
H ( jω )
ϕ (ω )
5
−10
0 (a)
10ω
−5 0 −5
5
ω
(b)
A C
、 f (t ) = cos t + cos(8t )
B
、 f (t ) = sin(2t ) + sin(4t )
2
、 f (t ) = sin(2t ) sin(4t ) D、 f (t ) = cos (4t ) 解：选 B。由系统的幅频特性和相频特性可知：若输入信号的频率均处于 ω = −5 ∼ 5 之间， 既不产生幅度失真又不产生相位失真。只有 B 满足这一条件。 d 6、信号 f (t ) = [e ε (t )] 的傅里叶变换 F ( jω ) 等于 dt
2017年招收攻读硕士学位研究生入学统一考试试题---电子线路试题
中国科学院研究生院2017年招收攻读硕士学位研究生入学统一考试试题科目名称：电子线路考生须知：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。
一、填空题（共18小题，每小题2分，共36分）1) 稳定电路输出电压应该采用的反馈组态是 ，稳定输出电流采用的反馈组态是 。
2) 反馈会影响电路的输出电阻，其中电压负反馈会 输出电阻，而电流负反馈会 输出电阻。
3) 放大电路在高频信号作用时放大倍数下降的原因是 存在，而低频信号作用时下降的原因是 存在。
4) 双极性集成运放的输入级多为 电路，中间级多为 电路，输出级多用 输出，偏置电路是 电路。
5) 差分放大电路有四种接法，分别是 、 、 、 ，其中 接法的共模抑制比KCMR 不为零。
6) 基本共射放大电路在放大区工作的条件是：发射结 ，其发射极电流Ie 是由 运动形成的；集电极 ，其集电极电流Ic 是由 运动形成的。
7) 十进制数(2537.80078125)10的十六进制表示形式是 。
8) 十进制数5的余3码BCD 编码为 。
9) 逻辑函数(,,)Y F A B C =的真值表如表1所示，则其最小项之和表示为 ，最大项之积表示为 。
10) 图1电路实现的是 功能。
11) TTL 门电路组成的逻辑电路如图2所示，F ＝ 。
Y图1 第一大题第10小题图G1A BF图2 第一大题第11小题图12) 图3为TTL 门电路组成的微分型 触发器，若其输出脉冲宽度为4W T s μ=，恢复时间为1s μ，则其输出信号最高频率为 KHz 。
13) 对最大幅值为5.1V ，带宽为20MHz 的模拟信号进行单通道A/D 转换，要求模拟信号每变化20mV 能使数字信号的LSB 变化，那么选择A/D 转换芯片的分辨率最少应为 位，转换速度最低为 MHz 。
14) 如图4所示，由CMOS 反向器G1、G2及电阻组成的电路为 触发器，若G1、G2的阈值电压为12TH DD V V =，则此电路的正向阈值电压T V +＝ 。
《西安电子科技大学》硕士研究生招生考试841机械原理初试真题
,,. :cc0L二三二三三二三：二三三三三三三王：与雯丘吉二号斗三r三？三三？三±二2二l二西安电子：科技大学』2019年硕士研究生招生考试初试试题考试科目代码及名称川841 机械原理－‘ 2018年 12 月 24 日下午 ＇（3 小时〉考试时间 二 －－答题要求z所有答案（填空题按照标号写）必须写在答题纸上，写在试题上→律作废，准考证号写在指定位置！一、判断题（共20分，每小题2分〉1.曲柄摇杆机构的行程速比系数K一定大T"4o，略Z2.一个较链囚杆机构，’如存在曲柄，则曲柄一定是最短杆。
3.对心直动尖顶从动件盘形凸轮机构的推程压力角超过许用值，可采用增大基圆半径的措施来解决。
4.对于一个曲柄摇杆机构来说，死点和极位是同一位置，只是原动件选择不同。
当曲柄为原动件时，曲柄与连杆共线的位置为桥位，…没有死点e5.若两轮的变位系数x1>0,x2=0，则该对齿轮传动中的轮2为标准齿轮。
6.在两轴交错角为go o的蜗轮蜗杆传动中，蜗杆与蜗轮的螺旋线旋向可以不相同。
7.在同样的条件下，三角螺纹的摩擦力矩大予矩形螺纹的摩擦力矩，因此三角螺纹多用于联接。
8.加速度影像原理只适用于同一构件，但速度影像原理既适用于构件，又适用于整个机构。
9.渐开线在分度圆上的压力角大于在齿顶圆上的压力角。
10.自由度为1的周转轮系为行星轮系。
二、摸空题（共20分，每小题2分）1.零件是一」!L一单元，构件是一半L单元。
2.两构件形成运动副，最多引入(3) 个约束，最少引入(4) 个约束。
3.平面五杆机构，共有－」�一个瞬心，其中有干旦L一个相对瞬心。
841机械原理试题共6页l第1页司二三三三二三三L E三三三三三三三τ二三二二三兰二一－一－－－－－4.机构演化的方法很多，偏心轮机构是通过一卫L一由曲柄滑块机构演化得到的：以对心曲柄滑块机构中的连杆为新机架得到�→机构，这种取不同的构件为新机架得到新机构的方法称为机构倒置。
西安电子科技大学821电路、信号与系统2017年考研专业课真题答案
二、利用替代定理和叠加定理
I1
I2
+ US
N
-
设I1由两部分组成，一部分由 US 产生，一部分由 I2 产生。
即 I1=I1′ +kI2, 其中I1′ 是由 US 产生的响应 {54==II1′1′++2kk ，联立可以得到 k=1, I1′ =3 所以I1=3+I2 当 R=∞，I2=0，所以I1=3A
2.(1) f1(������) = ∫−������∞ ������(2������ − 1)������������
=
1 2
∫−������∞
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(������
−
1)=12
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−
1)
2
(2) 当 a≠0 时
f2(������) = ∫−∞∞ ������������2(������������)������������
=2πa2 ∫−+∞∞(������(������0 + |������|) − ������(������0 − |������|)) (������(������ − ������0 + |������|) − ������(������ − ������0 − |������|))������������
V=tL0 =
3 0.0064
=
470m/s
一、1.
2017 信号与系统
f1(t) f1(t+1)ԑ(-t)
-2 -1
0
2
t
f2(-3t)
(1/3) t
1
-3 -2 -1 0
t
f2(5-3t)=f2(-3(t-5/3)) (3)