2015年-2017年江西师范大学887信号与系统考研真题试题试卷

江西师范大学777教育学专业综合历年考研真题汇编(含部分答案)+12

目录2015年江西师范大学777教育学专业综合考研真题 (4)2016年江西师范大学777教育学专业综合考研真题 (5)2017年江西师范大学777教育学专业综合考研真题 (6)2018年江西师范大学777教育学专业综合考研真题 (7)2018年江西师范大学777教育学专业综合考研真题及详解 (8)说明：2018年提供真题及其详解，其余年份只提供试题，没有提供答案。

一、名词解释（每小题10分，共60分）1．社会本位论2．教育模式3．壬戌学制4．《颜氏家训》5．英国公学6．程序性知识二、简答题（每小题20分，共120分）1．新中国成立以来我国社会主义不同历史时期的教育目的体现了哪些共同的规定性？2．简述现代德育的基本特点。

3．简述梁启超的师范教育思想。

4．简述文艺复兴时期人文主义教育的基本特征。

5．简述抽样的基本方法。

6．简述教育研究中假设的作用。

三、论述题（每小题30分，共120分）1．现代教育应如何适应当代科技革命的挑战，谈谈你的看法。

2．试述梁漱溟的乡村教育思想，并进行评析。

3．试析杜威实用主义教育思想及其对基础教育改革的启示。

4．联系教学实际，谈谈如何培养学生问题解决能力。

2018年江西师范大学777教育学专业综合考研真题及详解一、名词解释（每小题10分，共60分）1．社会本位论答：社会本位论是一种与人本位价值取向相对应，把满足社会需要视为教育根本价值的价值取向。

这种观点认为，社会是人们赖以生存发展的基础，教育是培养人的社会活动；教育培养的效果，只能以其社会功能的好坏来加以衡量，离开社会需要，教育就不能满足社会的需求。

因此，主张教育目的不应从人的本位出发，而应从社会需要出发，根据社会需要来确定。

其主要代表人物有法国的孔德、德国的那托尔卜、法国的涂尔干。

受具体的社会历史条件的制约，社会本位论看到了社会的作用忽视了个体的价值，不利于个体主动性和创造性的发挥。

2．教学模式答：教学模式是指在教学实践中形成的具有一定指导性的简约理念和可照着做的标准样式。

江西师范大学777教育学专业综合历年考研真题汇编(含部分答案)+12

3．壬戌学制答：“壬戌学制”是 1922 年北洋政府颁布的《学校系统改革案》中提到的学制系统，是年为旧历壬戌年，故称壬戌学制。为区别于民初的“壬子癸丑学制”，亦称“新学制”。新学制以下列七条标准为依据：①适应社会进化的需要；②发挥平民教育精神；③谋个性之发展；④注意国民经济力；⑤注重生活教育；⑥使教育易于普及； ⑦多留地方伸缩余地。在学校系统总说明中提出：学制分期大致以儿童身心发达时期为根据，采取纵横活动主义，教育以儿童为中心，顾及学生个性及智能，高等、中等教育之编课采用选科制，初等教育之升级采用弹性制。学制采用美国学制的一种，即“六三三四”制，规定初等教育 6 年（初级小学 4 年，高级小学 2 年）；中等教育 6 年（初级和高级中学各 3 年，师范学校 6 年，其中后期师范 3 年）；高等教育 3～6 年（大学 4～6 年，专门学校 3 年以上），入学年龄为 6 岁。学制《附则》还规定：注重天才教育，得变通年限及教程，使优异之智能尽量发展；对于精神或身体上有缺陷者，应施以相当之特种教育。
5．英国公学答：英国公学是指由公众团体集资兴办，以培养一般公职人员为目的的，学生是在公开场所接受教育的学校。公学设备完善、收费昂贵，逐渐成为英国著名的中等教育机构，其中影响最大的是伊顿、温彻斯特、圣保罗等九大公学。学校自成系统，管理权为贵族和教会掌握，不依靠国家和地方政府拨款，学费昂贵。主要招收经过严格的选择性考试的预备学校毕业生，修业 5 年。以培养升入著名大学的高材生，造就未来的领袖人物和学术人才为主要目标，有大学预科性质。学校规模不大，多实行男女分校，课程注重人文学科，侧重古典语和外语。
2．教学模式答：教学模式是指在教学实践中形成的具有一定指导性的简约理念和可照着做的标准样式。它具有为完成一定任务而活动的方法特性，也属于方法范畴。常见的教学模式有传授——接受教学模式、问题——探究教学模式、精讲多练模式、自学辅导模式、情境教学模式等。教学模式在教学中起着单一的教学方法所难以起到的具体而明确的引导和示范作用。教学方法是构成教学模式的基础及要素；教学模式的基本结构由理论依据、教学目标、操作程序和操作策略四部分构成，它的主要特点是概括性、操作性、针对性、整体性和有效性。

江西师范大学学科教学(物理)824普通物理2015到2017三套考研真题

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信号与系统试题库史上最全(内含答案)

信号与系统考试方式：闭卷考试题型：1、简答题（5个小题），占30分；计算题（7个大题），占70分。

一、简答题：1．dtt df t f x e t y t )()()0()(+=-其中x(0)是初始状态，为全响应，为激励，)()(t y t f 试回答该系统是否是线性的？[答案：非线性]2．)()(sin )('t f t ty t y =+试判断该微分方程表示的系统是线性的还是非线性的，是时变的还是非时变的？[答案：线性时变的]3．已知有限频带信号)(t f 的最高频率为100Hz ，若对)3(*)2(t f t f 进行时域取样，求最小取样频率s f =？[答案：400s f Hz =]4．简述无失真传输的理想条件。

[答案：系统的幅频特性为一常数，而相频特性为通过原点的直线]5．求[]⎰∞∞--+dt t t e t )()('2δδ的值。

[答案：3]6．已知)()(ωj F t f ↔，求信号)52(-t f 的傅立叶变换。

[答案：521(25)()22j f t e F j ωω--↔]7．已知)(t f 的波形图如图所示，画出)2()2(t t f --ε的波形。

[答案： ]8．已知线性时不变系统，当输入)()()(3t e e t x t t ε--+=时，其零状态响应为)()22()(4t e e t y t t ε--+=，求系统的频率响应。

[答案：())4)(2(52)3(++++ωωωωj j j j ]9．求象函数2)1(32)(++=s s s F ,的初值)0(+f 和终值)(∞f 。

[答案：)0(+f =2，0)(=∞f ]10．若LTI 离散系统的阶跃响应为)(k g ，求其单位序列响应。

其中：)()21()(k k g k ε=。

[答案：1111()()(1)()()()(1)()()(1)222k k k h k g k g k k k k k εεδε-=--=--=--]11．已知()1 1 , 0,1,20 , k f k else ==⎧⎨⎩ ，()2 1 , 0,1,2,30 , k k f k else -==⎧⎨⎩设()()()12f k f k f k =*，求()3?f =。

2010-2013年江西师范大学827真题

江西师范大学2010年硕士研究生入学考试试题（ A 卷）专业：学科教学（英语）科目：英语综合注：考生答题时，请写在考点下发的答题纸上，写在本试题纸或其他答题纸上的一律无效。

Ⅰ.Vocabulary: (20 points, 1 X 1)Directions: Choose the best word which has the closest meaning to the underli -ned word in the sentence.1.Hauchecome’s death was bought about by ________.A) remorse B) accusation C) rheumatism D) frustration2.Jack _______ crimson with embarrassment when his girl friend saw his dirty socks under the sheet.A) disputed B) fumbled C) flushed D) stopped3.The boy had a _______ expression because of silly mistakes he had made.A) rustic B) shamefaced C) incredulous D) desperate4.The poem handles the problem of instinct _______ intellect in man.A) versus B) positive C) implement D) academic5.The government _______ its policy of helping the unemployed.A) implemented B) enriched C) enrolled D) plagued6.Obviously, the Chairman’s marks at the conference were _______ and not planned.A) substantial B) spontaneous C) simultaneous D) synthetic7.Reporters and photographers alike took great _______ at the rude way the actor behaved during the interview.A) annoyance B) offence C) resentment D) irritation8.These continual _______ in temperature make it impossible to decide what to wear.A) transitions B) transformations C) exchanges D) fluctuations9.Susan has _______ the elbows of her son’s jacket with leather patches to make it more durable.A) reinforecd B) sustained C) steadied D) confirmed10.Although we tried to concentrate on the lecture, we were _______ by the noise from the next room.A) distracted B) displaced C) dispersed D) discarded11.The reason why so many children like to eat this new brand of biscuit is t-hat it is particularly sweet and _______.A) fragile B) feeble C) brisk D) crisp12.There is supposed to be a safety _______ which makes it impossible for trains to collide.A) appliance B) accessory C) machine D) mechanism13.For years now, the people of that faraway country have been cruelly _____ by a dictator.A) depressed B) immersed C) oppressed D) cursed14.Ever since the rise of industrialism, education has been _______ towards producing workers.A) harnessed B) hatched C) motivated D) geared15.He developed a _______ attitude after years of frustration in his career.A) sneaking B) disgusted C) drastic D) cynical16.They believed that this was not the _______ of their campaign for equality but merely the beginning.A) climax B) summit C) pitch D) maximum17.Several guests were waiting in the _______ for the front door to open.A) porch B) vent C) inlet D) entry18.As the mountains were covered with a _______ of cloud, we couldn’t see their tops.A) coating B) film C) veil D) shade19.We couldn’t really afford to buy a house so we got it on hire purchase and paid monthly _______.A) investments B) requirements C) arrangements D) installments20.The magician made us think he cut the girl into pieces but it was merely an _______.A) illusion B) impression C) image D) illumⅡ.Reading Comprehension: (40 points, 1 X 2)Directions: There are 4 passages in this part. Each passage is followed by so me questions or unfinished statements. For each of them there are 4 choices marked a, b, c, and d. You should decide on the best choice and write the an swer on the Answer Sheet.TEXT 1Pygmies are the earliest-known inhabitants of central Africa. They lived in t he Congo basin long before other groups migrated there--their presence confirm ed in ancient Egyptian records. They are gentle, peaceful people who conceal t he-mselves well in the rainforest. They have in recent times had to share with immigrant farmers. Pygmies do not farm, but trade meat, honey and other for -est products for knives, metal tools ,rice, corn and bananas. They are lighter skinned than some of their neighbors and different in stature. Adults are 1.2 to 1.5m tall.The Efe group of Pygmies of the Ituri forest in eastern Congo is one of the last to retain its original culture. The Efes, whose existence is threatened by l -ogging and farming in the forests in which they hunt, are among the Burundi group of Pygmies who live in north-eastern Congo.In Cameroon, there is a population of 35,000 Baka Pygmies,but this number is uncertain because of the group’s semi-nornadic lifestyle in wandering the ra -inforest in search of game and other foods. During the three-month rainy seas -on, when food is plentiful, the Baka leave their permanent villages to roam th e forest, rarely staying in one place more than a week.Men contract marriages during this crucial season; they prove their hunting a -bility by the game they bring home to the parents of a future wife.Men from farming tribes sometimes marry Pygmy women, although there is a ban again -st Pygmy men marrying women from farming tribes.Within the Baka culture, hunting elephant is one of the most important activ -ities,not only for food but for the symbolic meanings and prestige traditionally attached to it. Elephant hunting is linked to other cultural activities, including men’s initiation and women’s ritual songs.Hunting is performed with poisoned arrows, bows, crossbows, spears and traps. The Baka are interested in the out -side world while maintaining their identity and independence. And though they are attracted by much of what the outside world offers, they have always had access to the forest,a world that is completely their own.Their culture is robust enough to survive as long as the forest remains. Without it this culture will be meaningless.21.The fact that Pygmies are the earliest Central African inhabitants has been ______.A)established B)made C)discovered D)explored22.Pygmies are gentle and peaceful people who in stature is ________.A)unusually big C)normally smallB)normally big D)quite normal23.________fails to denote the name of a country.A)the Congo B)Ituri C)Burundi D)Cameroon24.Which of the following is NOT true according to the passage?A)A Baka Pygmy marriage takes place in the rainforestB)Of all Pygmies, the Efe group is the last group keeping its primitive cultureC)Pygmy men are forbidden to marry women from farming tribesD)Pygmy women are not forbidden to marry men from farming tribes25.Robust as Pygmy culture is, it can according to the text, by all means surv -ive ________.A)to the end of this centuryB)the next centuryC)the culture of farming tribes long in the outside worldD)as long as there is the rainforestTEXT 2The use of chemicals in almost all areas of life has become a commonplace phenmoenon. There is growing evidence ,however, that chemicals in the envir -onment, including pesticides, may contribute to some illnesses. While studies are still being conducted preliminary conclusions point to the verdict that such chemicals are indeed negatively impacting those humans to whom they are exp -osed.Children are especially vulnerable to toxic substancs. Pound for pound, they eat, drink and breathe more than adults,all of which expose them more heavily to those chemicals to which most individuals encounter on a daily basis. Fur-theremore, their bodies are still in developing stages, exacerbating the negative effects of those chemicals which negatively impact them.Of 50 types of pesticieds commonly used in American schools a study cond -ucted by the National Coalition Against the Misuse of Pesticides found thatmany caused negative reactions in laboratory animals. Such negative effects inc -luded kidney and liver damage, cancer, and neurological and reproductive prob -lems.These implications of these findings are far-reaching, Given the variety of ha -rmful effects attributed to those pesticides tested, one must pause and consider whether it is wise to continue their use in the nation’s schools,where children will be constantly exposed to them. Activists have lobbied for the elimination of such use with a degree of success, and recent findings, if supported by fur -ther analysis and confirmation, may help further the cause. A long term soluti on or alternative, however, remains elusive.In the short run, however, there may be some measures that can be taken to mitigate the harmful effects of dangerous pesticides. The American Medical Association’s Council on Scientific Affairs concluded in a 1997 report that giv-en the “particular uncertaint regarding the long-term health effects of low-dose pesticide exposures.”It is “prudent”for adults and children to limit their expos -ure and to “consider the use of the least toxic chemical pesticides or non-che-mical alternatives”.26.The citing of dangerous effects of pesticides on laboratory animals in paragr -aph 3 is used to suggest that _______.A)scientists are also concentrated with effects of pesticides on animalsB)cancer is the worst effect of the pesticidesC)most or all of the dangerous effects of pesticides are now knownD)the chemicals may also cause these effects in humans27.Children are more likely than adults to suffer the negative effects of pestici-des because ________.A)children absorb more pesticides than adults, proportionallyB)pesticides are used more in areas with childrenC)the pesticides used in schools are more dangerous than other pesticidesD)adults know more about pesticides than children28.The main point of this text is that _________.A)pesticides are dangerous and their uses need to be reevaluatedB)children suffer most from the effects of pesticidesC)schools are most responsible for pesticide-relate illnessesD)pesticides should be eliminates everywhere29.The author mentions the exaggerated effects of chemicals on children in par -agraph 2 to _____.A)prove that pesticides are dangerous to all humansB)show that children are more susceptible to many kinds of dangersC)suggest a solution to the problem of pesticidesD)identify one group that pesticides hurt in particular30.The author cites the American Medical Association’s advice in paragraph 4 in order to ________.A)present more factual details to clarify the issueB)present an alternative theory for considerationC)present a recommendation from a reputable sourceD)Present a solution drawn from all the evidence consideredTEXT 3It came as something of a surprise when Diana, Princess of Wales, made a trip to Angola in 1997,to support the Red Cross’s campaign for a total ban on all anti-personnel landmines. Within hours of arriving in Angola, television scre -ens around the world were filled with images of her comforting victims injure -d in explosions caused by landmines.”I knew the statistics”,she said,”But putti-ng a face to those figures brought the reality home to me; like when I met Sandra, a 13-year-old girl who had lost her leg, and people like her.”The Princess concluded with a simple message:”We must stop landmines”. And she used every opportunity during her visit to repeat this message. But, back in London, her views were not shared by some members of the British government,which refused to support a ban on these weapons. Angry politicians launched an attack on the princess in the press. They described her as”very ill -informed”and a “loose cannon”. The princess responed by brushing aside the Criticisms:”This is a distraction we do not need. All I’m trying to do is help”. Opposition parties, the media and public immediately voiced their support for Princess. To make matters worse for the government, it soon emerged that the Princess’s trip had been approved by the Foreign Office, and that she was in fact very well-informed about both the situation in Angola and the British go-vernment ‘s policy regarding landmines.The result was a severe embarrassment for the government. To try and limit the damage, the Foreign Secretary,Malcolm Rifkin, claimed taht the Princess’s views on landmines were not very different from government policy, and that it was “working towards”a worldwide ban. The Defense Secretary , Michael Portilo, claimed the matter was “a misinterpretation or misunderstanding.”For the Princess,the trip to this war-torn country was an excellent opportunity to use her popularity to show the world how much destruction and suffering lan -dmines can cause. She said that the experience had also given her the chance to get colser to people and their problems.31.Princess Diana paid a visit to Angola in 1997_______.A)to clarify the British government’s stand on landminesB)to establish her image as a friend of landmine victimsC)to investigate the sufferings of landmine victims thereD)to voice her support for a total ban of landmines32.What did Diana mean when she said “putting a face to those figures broug-ht the reality home to me”(Line 5, Para,1)?A)Meeting the landmine victims in person made her believe the statisticsB)She just couldn’t bear to meet the landmine victims face to faceC)The actual situation in Angola made her feel like going back homeD)Seeing the pain of the victims made she realized the seriousness of the situa -tion33.Some members of the British government criticized Diana because ______.A)she had not consulted the government before the visitB)she was ill-informed of the government’s policyC)they were actually opposed to banning landminesD)they believed that she had misinterpreted the situation in Angola34.How did Diana respond to the criticisms?A)She made more appearances on TVB)She paid no attention to themC)She rose to argue with her opponentsD)She met the 13-year-old girl as planned35.What did Princess Diana think of her visit to Angola?A)It had caused embarrassment to the British governmentB)It had greatly promoted her popularityC)It had brought her closer to the ordinary peopleD)It had affected her relations with the British governmentTEXT 4“History is written by the victors.”This famous phrase reverberates througho -ut the halls of history, constantly reminding us to take all that we learn with a grain of salt, knowing that the information provided for our dissemination was provided, shaped and influenced by this left to hold the pen that recorded it. In that respect, one of the worst crimes against history is the revision ofit, the altering of the record of the past so as to reflect the viewpoint of a biased group who stand to benefit from the altered version.By revising the lens by which history is judged, valuable information is lost, to the detriment of both students of the filed as well as the awareness that co-mes from experience. Without an accurately recorded account to serve as guidi -ng light, nations and societies are left to stumble their way about their affairs, ignorant of what has and hasn’t worked before, and unaware of what past ev -ents shaped and determined their present situation. Such dismal situations emer -ge from simple pride, as well as the desire of the revisionists to depict thems -elves in a better light to posterity or to cover up an embarrassing legacy, no matter the cost to the future.Recent attempts by nations involved in the second World War to minimize or erase altogether certain shameful incidents from their history textbook has been met with international outrage and protest, and rightly so. By allowing fu -ture generations to forget or never even learn about how their ancestors stumb -led on the path to progress, the experiences of those who suffered as a result of those mistakes are trivialized and made to be in its information. Both are heinous results for both nationals of that particular nation as well as those of the international community,whose stories intertwine to form the large picture.When a single string in the tapestry of world history is unraveled by revisio -n, the entire piece becomes a weaker one, subject to additional modification at the whim of those who would like to use history as a tool for their own purposes, even if it means fundamentally changing it. This outcome must be avoided at all costs, firstly by not allowing a precedent to be established that makes it acceptable, even in a single case, to commit the revision. Otherwise, humans as a race will fall prey to yet another oft-quoted phrase:”History, if fo -rgotten, is doomed to be repeated.”36.The first line of the text implies that _______.A)historical accounts are invariably colored by the views and stances of those who emerged victoriousB)those who have the power to do so will often influence recording of events to favor themselvesC)those who are defeated have little or no say in the documentation of their st ruggle, resulting in a biased account.D)the winners in a struggle have the moral obligation to accurately record eve-nts37.The author views the revision of history as _______.A)indisputably negative in all situationsB)generally harmful when done so to favor one side’s stanceC)always motivated by the desire to portray the reviser in a better lightD)Rendering the revised history useless for the purposeof analysis and learning38.In paragraph3, the author argues against historical revision with the assertion that ________.A)revision of World WarⅡevents has proven that such actions have a negative impactB)such revision results in an undeserved sense of national prideC)revising history has far-reaching effects beyond the borders of any one count -ryD)history is one of the primary concerns dealt with in the education system and should thus be pure39.In paragraph 4,”When a single string in a tapestry of world history is unra -veled by revision, the entire piece becomes a weaker one”means that ______.A).history is an intertwined series of events coming together to form a large pictureB)a loss of reliability in any single segment of history makes the entire histori -cal record suspectC)once one piece of history is revised, others soon followD)as soon as the integrity of the historical record is breached, it can never be fully recovered.40.The main point of text is that ________.A)revising history must be avoided in all situations at all costsB)the revision of history leads to a flawed perception resulting in loss of vital lessonsC)is revision of history goes on, the meaning behind the revised events will lo -se meaningD)historical revision is an international problem affecting all nations and people Ⅲ.Cloze (20 points, 1 X 2)When people __41__ to improve their breathing their initial thought is invar-iably to suck in the maximum possible draught of air __42__ you can’t pour wine into a full bottle. __43__you can’t fill the lungs with fresh air __44__ you’ve first drained them of every drop of stale air,__45__at the best of times only a sixth of the air in the lungs gets __46__with each fresh breath we take. If we breathe shallowly, or fail to clear the lunges of devitalized air, this poor rate of turnover declines __47__further.__48__always start your deep breathing exercises __49__collapsing the lungs as fully as possible. While you breatheout,imagine that you’re a hot air balloon collapsing slowly to the ground. This has a relaxing effect, particularly __50__ you quietly intone the world relax…relax…relax as you exhale.41.A)set forth B)set off C)set down D)set out42.A)But B)And C)Therefore D)Often43.A)At the same time B)In the same way C)More often than not D)Even if44.A)if B)unless C)after D)before45.A)Even B)Especially C)When D)Where46.A)changed B)changing C)to change D)change47.A)still B)more C)less D)farther48.A)Moreover B)So C)Yet D)Besides49.A)when B)in C)by D)on50.A)before B)even if C)if D)just beforeⅣ.Translation(40 points)Part A. Translate the following passage into English (20 points)依照中华人民共和国妇女权益保障法的规定，妇女在政治、文化、社会和家庭生活等方面享有与难自己平等的权利。

信号与系统试题库史上最全(内含答案)

信号与系统考试方式：闭卷考试题型：1、简答题（5个小题），占30分；计算题（7个大题），占70分。

一、简答题：1．dtt df t f x e t y t )()()0()(+=-其中x(0)是初始状态，为全响应，为激励，)()(t y t f 试回答该系统是否是线性的？[答案：非线性]2．)()(sin )('t f t ty t y =+试判断该微分方程表示的系统是线性的还是非线性的，是时变的还是非时变的？[答案：线性时变的]3．已知有限频带信号)(t f 的最高频率为100Hz ，若对)3(*)2(t f t f 进行时域取样，求最小取样频率4．] 5．求67[8)()4t e t ε-，910其中：)()2()(k k g k ε=。

[答案：1111()()(1)(()((1)()((1)222k k k h k g k g k k k k k εεδε-=--=--=--]11．已知()1 1 , 0,1,20 , k f k else ==⎧⎨⎩，()2 1 , 0,1,2,30 , k k f k else -==⎧⎨⎩设()()()12f k f k f k =*，求()3?f =。

[答案：3]12．描述某离散系统的差分方程为()()()122()y k y k y k f k +---=求该系统的单位序列响应()h k 。

[答案：21()[(2)()33kh k k ε=-+]13．已知函数()f t 的单边拉普拉斯变换为()1sF s s =+，求函数()()233ty t ef t -=的单边拉普拉斯变换。

[答案：()25Y s s s =++] 14．已知()()12f t f t 、的波形如下图，求()()()12f t f t f t =*（可直接画出图形）[0,≥t t π；[[答案：34231[9]()33t t t e e e t ε---=--]四、图示离散系统有三个子系统组成，已知)4c o s (2)(1πk k h =，)()(2k a k h k ε=，激励)1()()(--=k a k k f δδ，求：零状态响应)(k y f 。

信号与系统试题库史上最全内含答案

信号与系统试题库史上最全(内含答案)信号与系统考试方式：闭卷考试题型：1、简答题（5个小题），占30分；计算题（7个大题），占70分。

一、简答题：1．dtt df t f x e t y t )()()0()(+=-其中x(0)是初始状态，为全响应，为激励，)()(t y t f 试回答该系统是否是线性的？[答案：非线性]2．)()(sin )('t f t ty t y =+试判断该微分方程表示的系统是线性的还是非线性的，是时变的还是非时变的？[答案：线性时变的]3．已知有限频带信号)(t f 的最高频率为100Hz ，若对)3(*)2(t f t f 进行时域取样，求最小取样频率s f =？[答案：400s f Hz =]4．简述无失真传输的理想条件。

[答案：系统的幅频特性为一常数，而相频特性为通过原点的直线]5．求[]⎰∞∞--+dt t t e t )()('2δδ的值。

[答案：3]6．已知)()(ωj F t f ↔，求信号)52(-t f 的傅立叶变换。

[答案：521(25)()22j f t e F j ωω--↔]7．已知)(t f 的波形图如图所示，画出)2()2(t t f --ε的波形。

[答案： ]8．已知线性时不变系统，当输入)()()(3t e e t x t t ε--+=时，其零状态响应为)()22()(4t e e t y t t ε--+=，求系统的频率响应。

[答案：())4)(2(52)3(++++ωωωωj j j j ]9．求象函数2)1(32)(++=s s s F ,的初值)0(+f 和终值)(∞f 。

[答案：)0(+f =2，0)(=∞f ]10．若LTI 离散系统的阶跃响应为)(k g ，求其单位序列响应。

其中：)()21()(k k g k ε=。

[答案：1111()()(1)()()()(1)()()(1)222k k k h k g k g k k k k k εεδε-=--=--=--]11．已知()1 1 , 0,1,20 , k f k else ==⎧⎨⎩ ，()2 1 , 0,1,2,30 , k k f k else-==⎧⎨⎩设()()()12f k f k f k =*，求()3?f =。

信号与系统试题库含答案

s(s 2)(s 3)
2、
F (s)

s2 s2

4s 5 3s 2
[答案：（1） f (t) ( 2 e2t 2 e3t )(t)
3
3
（2） f (t) (t) (2et e2t ) (t) ]
十、已知系统的传递函数
H
(s)

s2
s4 3s
9
9
或： h(t) (1 et 17 e10t ) (t) ]
9
9
七、图（a）所示系统，其中 f (t) sin 2t ， s(t) cos(1000t) ，系统中理想带通滤波
2 t
器的频率响应如图（b）所示，其相频特性() 0, 求输出信号 y(t) 。
[答案： sin t cos1000t
B． e3tu(t)
C． e3tu(t)
D． e3tu(t)
7． f (t) e2tu(t) 的拉氏变换及收敛域为（）
A． 1 , Re{s} 2
s2
B． 1 , Re{s} 2
s2
C． 1 , Re{s} 2
s2
D． 1 , Re{s} 2
s2
8．
F (s)
)
A. 1 e j5
2 j
B. 1 e j2
5 j
C. 1
2 j( 5)
D.
1
2 j( 5)
5．已知信号 f(t) 如图所示，则其傅里叶变换为（
）
A．
2
Sa(
4
)

2
Sa(
2
)
B．
Sa(
4

2015年878信号与系统真题及答案详解

【解题思路】
版权所有翻印必究
举报邮箱：sysukyw08@
考察傅里叶级数的公式以及内容。
【答案】
x(t)
a e
jk ( 2 T )t
k
k
，
x(t) A t(a t a)
，
a
ak

1 T
x(t)e jkw0tdt
T

1a
2a

a
A jk t te a dt

1.
t cos(3t) (1 t)dt
2. 现有一离散时间的线性时不变系统，当输入 x[n] 0.5[n 3] 时，系统响应为
y[n] 0.5n [n 1],求该系统的单位冲激响应。 3. 若 x[n] n([n 1] [n 2]) ， h[n] 2([n] [n 3]) ，计算
d 2t
dt
dt
y' (0 ) 1，请回答下列问题。
（1）求解零输入响应 yzi (t) ，零状态响应 yzs (t) 和全响应 y(t) （2）求解系统函数 H (s) 和单位冲激响应 h(t)
（3）判断系统的稳定性。
（4）若系统初试松弛，且输入信号 x(t) et， t ，请确认此时的系统响应 y(t) 。
（3）判断系统的稳定性。
（4）若系统初试松弛，且输入信号 x(t) et， t ，请确认此时的系统响应 y(t) 。
【解题思路】考察微分方程的解答以及拉普拉斯变换的性质。
版权所有翻印必究
举报邮箱：sysukyw08@
【答案】
（1） Y
(s)(s2

信号与系统复习试题(含答案)

电气《信号与系统》复习参考练习题一、单项选择题：14、已知连续时间信号,)2(100)2(50sin )(--=t t t f 则信号t t f 410cos ·)(所占有的频带宽度为（） A ．400rad ／s B 。

200 rad ／s C 。

100 rad ／s D 。

50 rad ／sf如下图（a）所示，其反转右移的信号f1(t) 是（ d ）15、已知信号)(tf如下图所示，其表达式是（）16、已知信号)(1tA、ε（t）＋2ε(t－2)－ε(t－3)B、ε(t－1)＋ε(t－2)－2ε(t－3)C、ε(t)＋ε(t－2)－ε(t－3)D、ε(t－1)＋ε(t－2)－ε(t－3)17、如图所示：f（t）为原始信号，f1(t)为变换信号，则f1(t)的表达式是（）A、f(－t+1)B、f(t+1)C、f(－2t+1)D、f(－t/2+1)18、若系统的冲激响应为h(t),输入信号为f(t),系统的零状态响应是（ c ）19。

信号)2(4sin 3)2(4cos 2)(++-=t t t f ππ与冲激函数)2(-t δ之积为（）A 、2B 、2)2(-t δC 、3)2(-t δD 、5)2(-t δ，则该系统是（）＞－系统的系统函数．已知2]Re[,651)(LTI 202s s s s s H +++= A 、因果不稳定系统 B 、非因果稳定系统C 、因果稳定系统D 、非因果不稳定系统21、线性时不变系统的冲激响应曲线如图所示，该系统微分方程的特征根是（）A 、常数B 、实数C 、复数D 、实数+复数22、线性时不变系统零状态响应曲线如图所示，则系统的输入应当是（）A 、阶跃信号B 、正弦信号C 、冲激信号D 、斜升信号23. 积分⎰∞∞-dt t t f )()(δ的结果为( ) A )0(f B )(t f C.)()(t t f δ D.)()0(t f δ24. 卷积)()()(t t f t δδ**的结果为( )A.)(t δB.)2(t δC. )(t fD.)2(t f25. 零输入响应是( )A.全部自由响应B.部分自由响应C.部分零状态响应 D .全响应与强迫响应之差2A 、1-eB 、3eC 、3-e D 、1 27.信号〔ε(t)－ε(t －2)〕的拉氏变换的收敛域为 ( )A.Re[s]>0B.Re[s]>2C.全S 平面D.不存在28．已知连续系统二阶微分方程的零输入响应)(t y zi 的形式为t t Be Ae 2--+，则其2个特征根为( )A 。

信号与系统试题库史上最全内含答案详解

信号与系统考试方式：闭卷考试题型：1、简答题（5个小题），占30分；计算题（7个大题），占70分。

一、简答题：1．dtt df t f x e t y t )()()0()(+=-其中x(0)是初始状态，为全响应，为激励，)()(t y t f 试回答该系统是否是线性的？[答案：非线性]2．)()(sin )('t f t ty t y =+试判断该微分方程表示的系统是线性的还是非线性的，是时变的还是非时变的？[答案：线性时变的]3．已知有限频带信号)(t f 的最高频率为100Hz ，若对)3(*)2(t f t f 进行时域取样，求最小取样频率s f =？[答案：400s f Hz =]4．简述无失真传输的理想条件。

[答案：系统的幅频特性为一常数，而相频特性为通过原点的直线]5．求[]⎰∞∞--+dt t t e t )()('2δδ的值。

[答案：3]6．已知)()(ωj F t f ↔，求信号)52(-t f 的傅立叶变换。

[答案：521(25)()22j f t e F j ωω--↔]7．已知)(t f 的波形图如图所示，画出)2()2(t t f --ε的波形。

[答案： ] 8．已知线性时不变系统，当输入)()()(3t e e t x t t ε--+=时，其零状态响应为)()22()(4t e e t y t t ε--+=，求系统的频率响应。

[答案：())4)(2(52)3(++++ωωωωj j j j ]9．求象函数2)1(32)(++=s s s F ,的初值)0(+f 和终值)(∞f 。

[答案：)0(+f =2，0)(=∞f ]10．若LTI 离散系统的阶跃响应为)(k g ，求其单位序列响应。

其中：)()21()(k k g k ε=。

[答案：1111()()(1)()()()(1)()()(1)222k k k h k g k g k k k k k εεδε-=--=--=--]11．已知()1 1 , 0,1,20 , k f k else ==⎧⎨⎩ ，()2 1 , 0,1,2,30 , k k f k else-==⎧⎨⎩设()()()12f k f k f k =*，求()3?f =。

信号与系统的试题库史上最全(内含问题详解)

信号与系统考试方式：闭卷考试题型：1、简答题（5个小题），占30分；计算题（7个大题），占70分。

一、简答题： 1．dtt df t f x e t y t )()()0()(+=-其中x(0)是初始状态，为全响应，为激励，)()(t y t f 试回答该系统是否是线性的？[答案：非线性]2．)()(sin )('t f t ty t y =+试判断该微分方程表示的系统是线性的还是非线性的，是时变的还是非时变的？[答案：线性时变的]3．已知有限频带信号)(t f 的最高频率为100Hz ，若对)3(*)2(t f t f 进行时域取样，求最小取样频率s f =？[答案：400s f Hz =]4．简述无失真传输的理想条件。

[答案：系统的幅频特性为一常数，而相频特性为通过原点的直线]5．求[]⎰∞∞--+dt t t e t )()('2δδ的值。

[答案：3]6．已知)()(ωj F t f ↔，求信号)52(-t f 的傅立叶变换。

[答案：521(25)()22j f t e F j ωω--↔]7．已知)(t f 的波形图如图所示，画出)2()2(t t f --ε的波形。

[答案：]8．已知线性时不变系统，当输入)()()(3t e e t x t t ε--+=时，其零状态响应为)()22()(4t e e t y t t ε--+=，求系统的频率响应。

[答案：())4)(2(52)3(++++ωωωωj j j j ]9．求象函数2)1(32)(++=s s s F ,的初值)0(+f 和终值)(∞f 。

[答案：)0(+f =2，0)(=∞f ]10．若LTI 离散系统的阶跃响应为)(k g ，求其单位序列响应。

其中：)()21()(k k g k ε=。

[答案：1111()()(1)()()()(1)()()(1)222k k k h k g k g k k k k k εεδε-=--=--=--]11．已知()1 1 , 0,1,20 , k f k else ==⎧⎨⎩ ，()2 1 , 0,1,2,30 , k k f k else-==⎧⎨⎩设()()()12f k f k f k =*，求()3?f =。

信号与系统试题库史上最全(内含答案)概要

信号与系统考试方式：闭卷考试题型：1、简答题（5个小题），占30分；计算题（7个大题），占70分。

一、简答题：1．dtt df t f x e t y t )()()0()(+=-其中x(0)是初始状态，为全响应，为激励，)()(t y t f 试回答该系统是否是线性的？[答案：非线性]2．)()(sin )('t f t ty t y =+试判断该微分方程表示的系统是线性的还是非线性的，是时变的还是非时变的？[答案：线性时变的]3．已知有限频带信号)(t f 的最高频率为100Hz ，若对)3(*)2(t f t f 进行时域取样，求最小取样频率s f =？[答案：400s f Hz =]4．简述无失真传输的理想条件。

[答案：系统的幅频特性为一常数，而相频特性为通过原点的直线]5．求[]⎰∞∞--+dt t t e t )()('2δδ的值。

[答案：3]6．已知)()(ωj F t f ↔，求信号)52(-t f 的傅立叶变换。

[答案：521(25)()22j f t e F j ωω--↔]7．已知)(t f 的波形图如图所示，画出)2()2(t t f --ε的波形。

[答案： ]8．已知线性时不变系统，当输入)()()(3t e e t x t t ε--+=时，其零状态响应为)()22()(4t e e t y t t ε--+=，求系统的频率响应。

[答案：())4)(2(52)3(++++ωωωωj j j j ]9．求象函数2)1(32)(++=s s s F ,的初值)0(+f 和终值)(∞f 。

[答案：)0(+f =2，0)(=∞f ]10．若LTI 离散系统的阶跃响应为)(k g ，求其单位序列响应。

其中：)()21()(k k g k ε=。

[答案：1111()()(1)()()()(1)()()(1)222k k k h k g k g k k k k k εεδε-=--=--=--]11．已知()1 1 , 0,1,20 , k f k else ==⎧⎨⎩ ，()2 1 , 0,1,2,30 , k k f k else -==⎧⎨⎩设()()()12f k f k f k =*，求()3?f =。