《国际学术论文写作与发表》完整版答案

国际学术论文写作与发表1.1测验

【单选题】

论文写作就是将研究数据转变成科学____。

?A、文字

?B、知识

?C、产物

?D、数据

我的答案：B

【多选题】

什么是科学论文？

?A、记录原创性科学研究结果

?B、综述已有科学发现及其发展

?C、将正式发表或出版的

?D、书写文件

我的答案：ABCD

【判断题】

写论文就是简单的把一个个数据堆积上去的过程。

我的答案：×

【判断题】

科学论文，无要华丽的辞藻，要求清晰性，第一时间、第一地点，描述科学发现。

我的答案：√

1.2测验

【单选题】

科学论文的结构，第一步是____。

?A、方法

?B、背景和研究目的

?C、主要结果

?D、发现、理论

我的答案：B

【多选题】

科学研究的方法，分以下哪些步骤？

?A、科学假设

?B、提出科学问题

?C、实验验证

?D、得出结论或者是新的发现或新的理论

我的答案：ABCD

【判断题】

科学研究方法与科学论文写作之间有非常密切的关系，把科学研究的过程、科学论文写作的过程做比较，找到共同之处，将会收获很大帮助。

我的答案：√

【判断题】

好的研究结果必然带来优秀的论文。

我的答案：×

1.3测验

【多选题】

怎样才是一篇优秀的科学论文？

?A、明确要解决的有意义的科学问题

?B、有合理的科学假设

?C、有严密的实验设计

?D、有令人信服的实验结果

?E、有令人鼓舞的理论、实践意义及动人的故事情节我的答案：ABCDE

【多选题】

每一个人都是“三者”____。

?A、读者

?B、记者

?C、作者

?D、编者

我的答案：ACD

邹申版英语写作教程1课后答案-UNIT 2-keys

P21 Pronouns 1)She me 2)Me 3)Him 4)She 5)Who 6)Whoever 7)Who/whom 8)Whom P25 2 1)play a minor role 2) That’s Greek to me 3) belated action 4)Where there is smoke there is fire 5) be a utility man 6)walk into the trap 7) one’s face glowing with health 3 1)We must practice economy. We must reduce unnecessary expenditures. 2)It is essential to control environmental pollution. 3)We must arrive at the station on time. 4)Financial expenditures should be arranged in order of priority. 5)We should speed up construction of urban housing, so as to improve the housing conditions. 6)Private capital has to meet two conditions. First, the profits must be legal. Second, they must be excessive. 7)During the period of the Eleventh Five-Year Plan we must never neglect grain production. Instead, we must steadily increase it. P26 5 1)me 2)who 3)I 4)me/myself 5)me 6)each other’s 7)who 8)us 9)whom 10)Some 11)one’s 12)his 13)his 14)his his

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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 ／s

f如下图（a）所示，其反转右移的信号f1(t) 是（） 15、已知信号)(t f如下图所示，其表达式是（） 16、已知信号)(1t A、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（）

19。信号)2(4 sin 3)2(4 cos 2)(++-=t t t f π π 与冲激函数)2(-t δ之积为（） A 、2 B 、2)2(-t δ C 、3)2(-t δ D 、5)2(-t δ ，则该系统是（）＞－系统的系统函数．已知2]Re[,6 51 )(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 δ 24. 卷积)()()(t t f t δδ**的结果为( ) A.)(t δ B.)2(t δ C. )(t f D.)2(t f

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信号与系统期末考试试题一、选择题（共10题，每题3分，共30分，每题给出四个答案，其中只有一个正确的） 1、卷积f 1(k+5)*f 2(k-3) 等于。（A ）f 1(k)*f 2(k) （B ）f 1(k)*f 2(k-8)（C ）f 1(k)*f 2(k+8)（D ）f 1(k+3)*f 2(k-3) 2、积分 dt t t ? ∞ ∞ --+)21()2(δ等于。（A ）1.25（B ）2.5（C ）3（D ）5 3、序列f(k)=-u(-k)的z 变换等于。（A ） 1-z z （B ）-1-z z （C ）11-z （D ）1 1--z 4、若y(t)=f(t)*h(t),则f(2t)*h(2t)等于。（A ） )2(41t y （B ）)2(21t y （C ）)4(41t y （D ）)4(2 1 t y 5、已知一个线性时不变系统的阶跃相应g(t)=2e -2t u(t)+)(t δ,当输入f(t)=3e —t u(t)时，系统的零状态响应y f (t)等于（A ）(-9e -t +12e -2t )u(t) （B ）(3-9e -t +12e -2t )u(t) （C ）)(t δ+(-6e -t +8e -2t )u(t) （D ）3)(t δ +(-9e -t +12e -2t )u(t) 6、连续周期信号的频谱具有（A ）连续性、周期性（B ）连续性、收敛性（C ）离散性、周期性（D ）离散性、收敛性 7、周期序列2)455.1(0 +k COS π的周期N 等于（A ） 1（B ）2（C ）3（D ）4 8、序列和 ()∑∞ -∞ =-k k 1δ等于（A ）1 (B) ∞ (C) ()1-k u (D) ()1-k ku 9、单边拉普拉斯变换()s e s s s F 22 12-+= 的愿函数等于 ()()t tu A ()()2-t tu B ()()()t u t C 2- ()()()22--t u t D 10、信号()()23-=-t u te t f t 的单边拉氏变换()s F 等于 ()A ()()()232372+++-s e s s ()() 2 23+-s e B s

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UNIT 6 P75 1）The enraged father threatened to throw the screaming boy out of the room. 2）You can use the frequently used method. 3）Tommy, filled with despair, left the office. 4）Smiling through the window, the girl is enjoying one of the happiest days in her life. 5）The boy was sitting at his desk, his feet gently tapping the floor. 6）The computers damaged by an unknown virus, the employees are happy to take the day off. P76 Task1 Sentences 1) and 2) participles as attributes Sentences 3) and 4) participles to indicate simultaneous actions Sentences 5) and 6) as absolute constructions P78 1. smiling 2. Reading 3. Swimming 4. competing broken informing 8. Having exhausted relieved P80 Task 2 1.The computer bought last week brings happiness to everyone in my family. 2.Being back in my hometown, I didn’t know that my professor had \assigned another 5000-word paper. 3.Standing in front of the picture painted by a post-impressionist, many people pretended that they could understand it. 4.Looking out of the window of the train, the boy was amused by the power lines dancing up and down in the air. P81 Classroom Activities Task 1 1.Kate fell asleep when reading Bo b’s letter. 2.She started to chat with her friend after finish/ having finished her work. 3.Although having seen it a thousand and one times, the old man still watches the video from time to time. 4.Though closely watched by the guards, the prisoner plans to escape. 5.It is believed that if read many times, an article will naturally be understood. 6.if buying more, you can pay less. P82 B a. 2) P83 Classroom activities Task 1 1)Thinking about her kid at home, Judy… 2)Racing along the street, the car sent… 3)Born in educated in …, she is now working …

信号与系统试题附答案

信科0801《信号与系统》复习参考练习题参考答案信号与系统综合复习资料考试方式：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．dt t 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)()22 j f t e F j ωω --?]

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新世纪高等院校英语专业写作教程第一册unit1-4课后答案

Unit 1 . The little boy was chicken-hearted. 2)That statesman is a respectable figure in the political arena. 3)We sat down by the oak tree ,enjoying the breeze coming from the lake. 4)We need to drink the milk before it sours. 5)The child had difficulty finding his way to school. 6)The young woman received a lot of flowers and gifts. 7)My father drew back the curtain a little lest I see him. 8)Our university can accommodate 4,000 students. 9)Social customs vary greatly from country to country. experienced 2)elapsed 3)attempting 4)with 5)take up 6)made 7)endeavor 8)true The state attorney said that the man would be prosecuted. 2)We suppose that a referee should be disinterested but not uninterested. 3)Tony can hit a ball farther than I can. 4)We must pursue this matter farther. 5)The principle behind our constitution are a principal reason for its astounding success. 6)All the band instruments except the tuba will be carried to the auditorium for the music contest. 7)The federal government comprises the legislative,judicial,and executive branches. 8)The whole region was struck by an economic disaster. 9)(correct) 10)He was awaked to the risk. Sixty hours is the amount of work time I contracted for. 2)The jury is expected to reach its decision very quickly. 3)Each of the candidates for the position has exceptionally high qualifications. 4)Every boy and girl in the sixth grade was at fault.. 7)He is one of the students who plan to attend the speech contest. 8)The jury are to be isolated in individual hotel rooms each night during the trial. 9)Sam sprawled in the chair and knocked over one of the lamps which were on display. 10)The symptoms of mercury poisoning vary with each individual case. 11)He believes that athletics improves school morale. 12)Up goes the starter”s gun,and each of the runners becomes tense. 13)Either The Moning Post or The City News is a reliable sourse of news. 14)The first thing that catches your eye is the headlines. 15)She is one of the women who have made this country what it is.

信号与系统试题附答案

信科0801《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 ／s

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（） 19。信号)2(4sin 3)2(4cos 2)(++-=t t t f π π 与冲激函数)2(-t δ之积为（） A 、2 B 、2)2(-t δ C 、3)2(-t δ D 、5)2(-t δ ，则该系统是（）＞－系统的系统函数．已知2]Re[,6 51)(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

(完整版)写作教程(一)unit1答案

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Unit 1 PART Ⅱ FOCUS Denotation and Connotation Suggested answer to the question If it is your teacher, most probably you will choose b, as the word portly has an implication of a more or less dignified and imposing appearance (e.g. an elderly gentleman, large and portly). However, if it is a doorkeeper, an amiable middle-aged woman, you may choose the word plump as it implies a pleasing fullness of figure (e.g. the plump goddesses of Renaissance paintings). From this exercise we can conclude that words that share the same denotative meanings can be diverse in their connotative meanings. Reference for the Classroom Activities 1.father: the male parent. It connotes support and sternness; it also connotes protection but in a serious fashion. wildflower: uncultivated plant; it connotes vitality and pleasantness. 2. Word Denotation Connotation Sentence gold a precious yellow metal wealth, value, preciousness, etc Silence is gold. moon the natural body that moves around the earth once every 28 days tranquility, purity, something out of reach, etc. There’s no point hoping for peace in the country. It’s like asking for the moon. ice water frozen so that it has become solid coldness, indifference, cruelty, death, etc. The ice in his voice was only to hide the pain. blood red liquid flowing through the bodies of humans and animals family background, descent, race, temperament, etc. Blood is thicker than water. bravery, spirit, and toughness. b. Anyway, she has the characteristics of a woman, such as frailty and delicacy. Attitude Reference for the Classroom Activities 1. Favorable Neutral Unfavorable unique, quaint strange bizarre, abnormal resolute, steadfast stubborn, dogged pigheaded compliment (v.) praise, commend, flatter lick one’s boots senior citizen old person fossil bachelor girl single woman spinster Collocation Suggested answers to the exercise a.do somebody a favor b.do somebody good c.make a gesture d.do evil

信号与系统试卷和答案

南湖学院机电系《信号与系统》课程考试试题 2013—2014学年第二学期 N 电信12班级时量：120分钟总分：100分考试形式：开卷(A) 一、填空题（每小题2分，共20分） 1、)2()()(-t t u t f δ=（）。 2、=-*-)()(21t t t t f δ（）。 3、拉普拉斯变换是把时域信号变换到（）。 4、对一个频带限制在0~4KHz 的语音信号进行抽样，则奈奎斯特速率是（）。 5、从信号频谱的连续性和离散性来观察，非周期信号的频谱是（）的。 6、线性时不变连续因果系统是稳定系统的充分必要条件是)(s H 的极点位于（）。 7、信号不失真传输的条件是系统函数=)(ωj H （）。 8、若自由响应对应系统微分方程的齐次解，则强迫响应对应系统微分方程的（）。 9、零输入线性是指当激励为0时，系统的零输入响应对各（）呈线性。 10、采用（）滤波器即可从已抽样信号中恢复原模拟信号。二、选择题（每小题2分，共20分） 1、信号 x (-n +2) 表示（）。 A 、信号x (n )的右移序2 B 、信号x (n )的左移序2 C 、信号x (n )反转再右移序2 D 、信号x (n )反转再左移序2 2、二阶前向差分)(2n x ?的表示式是（）。 A 、)()1(2)2(n x n x n x ++++ B 、)()1(2)2(n x n x n x ++-+ C 、)2()1(2)(-+-+n x n x n x D 、)2()1(2)(-+--n x n x n x 3、在以下关于冲击信号)(t δ的性质表达式中，不正确的是 ( )。 A 、? ∞ ∞ -=')()(t dt t δδ B 、?∞ ∞ -='0)(dt t δ C 、 ? ∞ -=t t u dt t )()(δ D 、)()(t t δδ=- 4、下列4个常用信号的傅立叶变换式中，不正确的是( )。 A 、)(21ωπδ? B 、)(200ωωπδω-?t j e C 、()()[]000cos ωωδωωδπω++-?t D 、()()[]000sin ωωδωωδπω++-?j t 5、系统仿真图如图所示，则系统的单位冲激响应)(t h 满足的方程式是（）。

新世纪高等院校英语专业写作教程第一册Unit-1-4课后答案

Unit 1 . 1.1)The little boy was chicken-hearted. 2)That statesman is a respectable figure in the political arena. 3)We sat down by the oak tree ,enjoying the breeze coming from the lake. 4)We need to drink the milk before it sours. 5)The child had difficulty finding his way to school. 6)The young woman received a lot of flowers and gifts. 7)My father drew back the curtain a little lest I see him. 8)Our university can accommodate 4,000 students. 9)Social customs vary greatly from country to country. 3.1)experienced 2)elapsed 3)attempting 4)with 5)take up 6)made 7)endeavor 8)true 4.1)The state attorney said that the man would be prosecuted. 2)We suppose that a referee should be disinterested but not uninterested. 3)Tony can hit a ball farther than I can. 4)We must pursue this matter farther. 5)The principle behind our constitution are a principal reason for its astounding success. 6)All the band instruments except the tuba will be carried to the auditorium for the music contest. 7)The federal government comprises the legislative,judicial,and executive branches. 8)The whole region was struck by an economic disaster. 9)(correct) 10)He was awaked to the risk. 6.1)Sixty hours is the amount of work time I contracted for. 2)The jury is expected to reach its decision very quickly. 3)Each of the candidates for the position has exceptionally high qualifications. 4)Every boy and girl in the sixth grade was at fault.. 7)He is one of the students who plan to attend the speech contest. 8)The jury are to be isolated in individual hotel rooms each night during the trial. 9)Sam sprawled in the chair and knocked over one of the lamps which were on display. 10)The symptoms of mercury poisoning vary with each individual case. 11)He believes that athletics improves school morale. 12)Up goes the starter”s gun,and each of the runners becomes tense. 13)Either The Moning Post or The City News is a reliable sourse of news. 14)The first thing that catches your eye is the headlines. 15)She is one of the women who have made this country what it is.