江西师范大学887信号与系统2017年考研专业课真题试卷
2015年-2017年江西师范大学887信号与系统考研真题试题试卷
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2015 年江西师范大学 887 信号与系统考研真题试题试卷··········································· 2 2016 年江西师范大学 887 信号与系统考研真题试题试卷··········································· 6 2017 年江西师范大学 887 信号与系统考研真题试题试卷········································· 10
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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。
(完整word版)信号与系统考试试题及答案,推荐文档
长沙理工大学拟题纸课程编号 1拟题教研室（或老师）签名 教研室主任签名 符号说明：)sgn(t 为符号函数，)(t δ为单位冲击信号，)(k δ为单位脉冲序列，)(t ε为单位阶跃信号，)(k ε为单位阶跃序列。
一、填空（共30分，每小题3分）1. 已知)()4()(2t t t f ε+=，求_______)("=t f 。
)('4)(2)("t t t f δε+2. 已知}4,2,4,3{)(},1,2,2,1{)(=-=k h k f ，求______)()(=*k h k f 。
}4,6,8,3,4,10,3{)()(-=*k h k f3. 信号通过系统不失真的条件为系统函数_______)(=ωj H 。
0)(t j Kej H ωω-=4. 若)(t f 最高角频率为m ω，则对)4(t f 取样的最大间隔是______。
m T ωπωπ4max max ==5. 信号t t t f ππ30cos 220cos 4)(+=的平均功率为______。
101122222=+++==∑∞-∞=n n F P6. 已知一系统的输入输出关系为)3()(t f t y =，试判断该系统是否为线性时不变系统______。
故系统为线性时变系统。
7. 已知信号的拉式变换为)1)(1(1)(2-+=s s s F ，求该信号的傅立叶变换)(ωj F =______。
故傅立叶变换)(ωj F 不存在。
8. 已知一离散时间系统的系统函数2121)(---+=z z z H ，判断该系统是否稳定______。
故系统不稳定。
9. =+-+⎰∞∞-dt t t t )1()2(2δ______。
310. 已知一信号频谱可写为)(,)()(3ωωωωA e A j F j -=是一实偶函数，试问)(t f 有何种对称性______。
关于t=3的偶对称的实信号。
二、计算题（共50分，每小题10分）1. 已知连续时间系统的单位冲激响应)(t h 与激励信号)(t f 的波形如图A-1所示，试由时域求解该系 统的零状态响应)(t y ，画出)(t y 的波形。
信号与系统考试试题与答案
长沙理工大学拟题纸课程编号1拟题教研室（或老师）签名 教研室主任签名符号说明：sgn(t) 为符号函数，(t )为单位冲击信号，(k ) 为单位脉冲序列，(t ) 为单位阶跃信号，( k) 为单位阶跃序列。
一、填空（共 30 分，每小题 3 分）1. 已知 f (t ) (t 2 4) (t ) ，求 f " (t) _______ 。
f " (t )2 (t ) 4 '(t )2. 已知 f (k ){1,2, 2,1}, h(k ) { 3,4,2,4} ，求 f (k ) h(k )______ 。
f (k ) h(k ){ 3,10,4,3,8, 6,4}3. 信号通过系统不失真的条件为系统函数H ( j) _______ 。
H ( j ) Kej t 0f ( t)Tmax4若f (t )最高角频率为______ 。
4. m ，则对4 取样的最大间隔是maxmP222221110信号 f (t )4cos20 t2cos30F n5. t 的平均功率为 ______ 。
n6. 已知一系统的输入输出关系为y(t)f (3t)，试判断该系统是否为线性时不变系统______。
故系统为线性时变系统。
F ( s)(s 211)( s 1)F ( j) =______。
故傅立叶变换7. 已知信号的拉式变换为，求该信号的傅立叶变换 F ( j ) 不存在。
H (z)1______。
故系统不稳定。
8. 已知一离散时间系统的系统函数2 z 1z 2 ，判断该系统是否稳定9.(t 2 2t ) ( t1)dt______ 。
310. 已知一信号频谱可写为F ( j) A( )ej 3, A( ) 是一实偶函数， 试问 f (t) 有何种对称性 ______ 。
关于 t=3 的偶对称的实信号。
二、计算题（共 50 分，每小题 10 分）1. 已知连续时间系统的单位冲激响应h(t)与激励信号f (t )的波形如图 A-1 所示，试由时域求解该系统的零状态响应y(t ) ，画出 y(t ) 的波形。
信号与系统试题库含答案
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
江西师范大学考研真题2017年硕士研究生入学考试试题管理学(B)参考答案要点硕士研究生专业课考试试题
江西师范大学2017年全日制硕士研究生入学考试试题（ B 卷）参考答案要点专业：120100管理科学与工程02、03、05方向科目：873 管理学IV 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。
（本试题共4 页）一、名词解释（每小题5分，共30分）1、管理：是指为了有效地实现组织目标、个人发展和社会责任，运用管理职能进行协调的过程。
其具体内涵包括：（１）管理是人类有意识、有目的的活动。
管理的目的首先是为了通过群体的力量实现组织目标。
另外也要十分关注实现组织中每个人的发展和实现组织的社会责任。
（２）管理应当是有效的。
有效性是指不仅要正确地做事（效率），并且要力争做正确的事（效果）。
（３）管理的本质是协调。
协调包括：一是组织内部各种有形和无形资源之间的协调，使其组成一个有机整体，形成强大的竞争能力；二是组织与外部环境的协调。
（４）协调是运用各种管理职能的过程。
协调的有效进行所要运用的，在管理学范畴内就是计划、组织、指挥等管理职能的过程。
2、人本原理：人本原理强调人在管理中的主体地位，人事管理系统中最活跃、最具有能动性、创造性的要素，是其它构成要素的主宰。
管理是为人服务的，做好人的工作是管理的根本，管理的核心是使人性得到最完美的发展。
尊重人、依靠人、发展人、为了人是人本原理的基本内容和特点。
3、业务流程再造BPR：BPR(Business Process Reengineering)也译为“业务流程重组”、“公司再造”、“再造工程”。
所谓“再造工程”，简单地说就是以工作流程为中心，重新设计企业的经营、管理及运作方式。
一般是“为了飞越性地改善成本、质量、服务、速度等重大的现代企业的运营基准，对工作流程进行根本性重新思考并彻底改革”。
特点：“从头改变，重新设计”。
4、组织文化：指组织在长期的实践活动中所形成的并且为组织成员普遍认可和遵循的具有本组织特色的价值观念、团体意识、行为规范和思维模式的总和。
信号与系统(江西师范大学)智慧树知到答案章节测试2023年
第一章测试1.两个周期性离散序列的叠加一定是周期序列。
A:错B:对答案:B2.模拟信号数字化的步骤有（）。
A:编码B:离散C:抽样D:量化答案:ACD3.动态系统是否线性的判决条件有（）。
A:微积分性质B:零状态响应线性C:可分离性D:零输入响应线性答案:BCD4.实现微分功能的系统是稳定的系统。
A:对B:错答案:B5.线性时不变连续系统具有积分特性。
A:对B:错答案:A第二章测试1.0-值一定不等于0+值。
A:错B:对答案:A2.齐次解的函数形式与激励无关。
A:对B:错答案:A3.卷积积分具有什么性质（）。
A:交换律B:结合律C:等效律D:分配率答案:ABD4.冲激响应是阶跃响应的积分。
A:对B:错答案:B5.阶跃信号与阶跃信号的卷积等于斜变信号。
A:错B:对答案:B第三章测试1.特解的函数形式与激励有关。
A:错B:对答案:B2.A:对B:错答案:B3.单位序列是奇异序列。
A:对B:错答案:B4.自由响应就是零输入响应。
A:对B:错答案:B5.求零状态响应时，初始状态为0。
A:对B:错答案:A第四章测试1.任何信号都可以进行傅里叶变换。
A:错B:对答案:A2.实数信号的相频一定是偶函数。
A:错答案:A3.时域的压缩相当于频域的压缩。
A:错B:对答案:A4.调制的目的是频谱搬移。
A:错B:对答案:B5.抽样电路可以由乘法器和低通滤波器组成。
A:错B:对答案:B第五章测试1.因果信号的拉氏变换域是Re【s】大于a。
A:错B:对答案:B2.拉氏变换不满足线性条件。
A:对B:错答案:B3.A:B:C:D:答案:B4.拉氏逆变换可以直接积分得到。
A:对B:错答案:B5.只有真分式才能进行部分分式展开。
A:错B:对答案:B第六章测试1.因果序列的z变换收敛域是某个圆内。
A:错答案:A2.单边z变换满足线性性质。
A:对B:错答案:A3.A:B:C:D:答案:B4.单边逆z变换的幂级数展开法不能够得到闭合解。
信号与系统_江西师范大学中国大学mooc课后章节答案期末考试题库2023年
信号与系统_江西师范大学中国大学mooc课后章节答案期末考试题库2023年1.先抽取后内插能还原原序列。
答案:错误2.正弦序列一定是周期序列答案:错误3.卷积和图示法的步骤有答案:相乘_位移_换元_折叠4.零状态响应是指激励f(t)为0时的系统响应。
答案:错误5.0+值一定等于0-值。
答案:错误6.齐次解的待定常数要根据初始条件求得。
答案:正确7.关于连续时间系统的单位冲激响应，下列说法中正确的是答案:单位阶跃响应与δ’(t)的卷积_系统单位阶跃响应的导数_系统在δ（t）作用下的零状态响应8.奇函数的频谱密度函数的实部为0.答案:正确9.所有的信号都存在傅里叶变换.答案:错误10.时域信号的扩展将导致频域信号的扩展.答案:错误11.没有信号可以既是有限时长的同时又有带限的频谱。
答案:正确12.两个离散周期信号之和一定是周期信号。
答案:正确13.若信号是实信号，则其傅里叶变换的相位频谱是偶函数。
答案:错误14.信号时移只会对幅度谱有影响。
答案:错误15.对连续周期信号取样所得的离散时间序列也是周期信号。
答案:正确16.用有限项傅里叶级数表示周期信号，吉布斯现象是不可避免的。
答案:正确17.单边z变换具有哪些性质？答案:线性性质_尺度变换_初值定理_终值定理18.以下为4个信号的拉氏变换,其中存在傅里叶变换的信号是答案:1/s_1_1/s+219.功率信号的特点是答案:能量无穷大_功率有限20.线性系统具有答案:分解特性_零状态线性_零输入线性21.下列信号的分类方法不正确的是答案:数字信号和离散信号22.对于稳定的LTI连续系统，它的系统函数H(s)的极点答案:全部位于左半开复平面上23.如题1.6图中所示周期信号的傅立叶级数中所含有的频率分量是【图片】答案:余弦项的偶次谐波，直流24.一信号x(t)的最高频率为500Hz，则利用冲激串采样得到的采样信号x(nT)能唯一表示出原信号的最大采样周期为答案:0.00125.差分方程y(k)+2y(k-1)=f(1-k) 所描述的系统是什么系统答案:线性时变26.幂级数展开法无法得到闭合解答案:正确27.非因果序列的收敛域|z|>|a|答案:错误28.单位序列的z变换等于答案:129.δ(t)的拉氏变换等于1。