桂林电子科技大学2016年考研试题912土木工程材料(2016-A)

桂林电子科技大学2016年考研试题912土木工程材料(2016-A)
桂林电子科技大学2016年考研试题912土木工程材料(2016-A)

桂林电子科技大学

2016年硕士研究生统一入学考试试题

科目代码: 912 科目名称: 土木工程材料

请注意:答案必须写在答题纸上(写在试题上无效)。答题纸请注明页码与总页数。

一、名词解释(20分,每题4分)

1、泥块含量

2、磨光值

3、钢材的疲劳强度

4、水泥混凝土

5、终凝

二、填空题(20分,每空1分)

1、沥青的三大指标为、和,表示沥青感温性的指标为、针入度粘度指标PVN等。

2、乳化沥青的组成有沥青、、和稳定剂。

3、我国粘稠沥青的牌号是按划分的,测试仪器名称为,测试条件为:的温度、的荷重、的下沉时间。

5、按矿料级配组成特点,将沥青混合料分为悬浮密实结构、

和结构。

6、在评定沥青与粗集料粘附性的试验中根据沥青混合料的最大粒径决定,对于大于13.2mm的粗集料采用,小于13.2mm采用。

7、钢材按照冶炼时脱氧的程度可分为沸腾钢、、、。

9、硅酸盐水泥熟料的主要矿物成分为,硅酸三钙、硅酸二钙,铝算三钙和,它们的简式为:C3S、C2S、C3A和。

三、选择题(40分,每小题2分)

1、石料的抗压强度和以下哪些因素相关()

A 岩石的矿物组成

B 加载速度

C 试样的干燥状态

D 实验温度

2、以下实验方法可以用来评价石料的抗冻性的是:()

A 洛杉矶磨耗实验

B 冻融劈裂实验

C 摆式摩擦仪

D 坚固性实验

3、下列哪些指标可以用来表征石料的强度()

A 压碎值

B 磨光值

C 磨耗值D冲击值

4、影响沥青老化的因素()

A 温度

B 光

C 氧

D 水

5、以下()不是沥青所具有的特点。

A、具有良好的憎水性

B、具有良好的粘结性

C、具有较大的塑性变形

D、具有较高的抗压强度

6、以下()不是按原油加工方法分类得到的沥青。

A、直馏沥青

B、氧化沥青

C、乳化沥青

D、溶剂沥青

7、下列材料可以用作改性剂的是()

A SBS

B PE

C EVA

D 橡胶粉、

8、下列选项可视为乳化沥青的优点的是?()

A 可冷态施工,节约能源,减少环境污染;

B 常温下具有较好的流动性,能保证洒布的均匀性;

C采用乳化沥青,扩展了沥青路面的类型,如稀浆封层;

D可延长施工季节,乳化沥青施工低温雨季影响较少。?

9、随着砂率的增加,水泥混凝土的坍落度将会()

A、增大

B、减小

C、不变

D、先增加后减小

10、下列关于水在水泥混凝土中的作用的描述正确的是()

A供水泥的水化反应

B 赋予混凝土的和易性

C使混凝土中产生孔隙,对抗渗透性、强度和耐久性不利

D 节约水泥用量

11、下列材料属于水泥混凝土外加剂的是()

A 减水剂

B 矿渣

C 缓凝剂

D 粉煤灰

12、水泥混凝土的和易性包括:()

A流动性B捣实性C粘聚性D保水性

13、下列关于水泥混凝土砂率的说法正确的是:()

A 砂率是指砂占水泥混凝土质量比率;

B 当水灰比和单位用水量一定时,存在合理砂率(最优砂率);

C当水灰比和单位用水量一定时,拌和物坍落度先随砂率增加而增大,达到最大值后,又随砂率增加而减小;

D当水灰比和单位用水量一定时,拌和物坍落度先随砂率增加而减小,达到最小值后,又随砂率增加而增大;

14、下列关于碎石和卵石对水泥混凝土性能影响说法正确的是()

A 针片状的颗粒比等径形状的颗粒更不利于集料的滑动,因此,前者不利于混凝土拌合物的流动性

B表面光滑且呈等径形状的颗粒比粗糙表面且有棱角的颗粒更利于集料的滑动,而且,前者的表面积小于后者

C在水泥浆用量相同时,前者拌制的砼拌合物坍落度大于后者;

D当坍落度或维勃稠度相同时,前者拌制的砼拌合物所需用水量小于后者。

15、下列哪些条件是水泥混凝土碱-集料反应发生的必要条件()

A 水泥中碱含量高;

B 集料中含有活性二氧化硅成分;

C 有水的存在;

D 水泥中CaO含量偏高;

16、粉煤灰硅酸盐水泥的代号是()。

A P.O

B P.S

C P.P

D P.F

17、水泥石的组成有:()

A 固相

B 气相

C 液相

D 只有固相

18、下列结构属于路面的是()。

A 上面层

B 下面层

C 基层

D 土基

19、下列沥青混合料类型属于骨架密实结构的是()

A AC13

B SMA10

C SUP20

D AM20

20、以下实验方法可以用来评价石料的耐磨性的是:()

A 洛杉矶磨耗实验

B 冻融劈裂实验

C 摆式摩擦仪

D 车辙实验

四、判断题(10分,每小题1分)

1、孔隙率是指石料孔隙体积占石料总体积(包括开口孔隙和闭口孔隙体积)的百分率。()

2、吸水率指常温、常压条件下石料最大吸水质量是干燥试样质量的百分率。()

3、水泥混凝土用集料的粗细界限尺寸为4.75mm。()

4、90号沥青比70号沥青软。()

5、石油沥青中,石蜡含量越丰富,沥青路用性能越好。()

6、沥青针入度试验的标准温度是15℃,延度试验的标准温度25℃。()

7、沥青混合料用集料粗细界限尺寸为2.36mm。()

8、沥青混合料的级配越细越好()。

9、为了降低过火火石灰的危害,需要将其在水中陈伏15d。()

10、使用引气剂可以有效的提高水泥混凝土的抗冻性。()

五、简答题(30分)

1、石料真实密度、表观密度、毛体积密度和堆积密度的区别。(6分)

2、根据矿料级配曲线的形状,有以下几种不同级配形式:(6分)

3、与普通沥青相比,改性沥青有哪些优点? (6分)

4、改性沥青生产工艺?(6分)

5、什么是新拌水泥混凝土的分层离析,危害是什么?(6分)

六、计算分析题(30分)

1、根据下列材料使用图解法确定矿质混合料的配合比。(15分)

各档集料筛分试验结果(通过率,%)

筛孔尺寸(mm)

设计级配范围通过率(%)

A B C D

26.5 100 100 100 100 100

19 95 100 100 100 95-100

16 58 100 100 100 75-90

13.2 40 85 100 100 62-80

9.5 23 60 98 100 52-72

4.75 10 40 80 100 38-58

2.36 4 23 46 100 28-46

1.18 - 10 33 100 20-34

0.6 - 5 19 97 15-27

0.3 - - 11 94 10-20

0.15 - - - 92 6-14

0.075 - - - 70.5 4-8

2、普通水泥混凝土配合比设计:根据下列材料设计水泥混凝土初步配合比(15分) (1)组成材料

普通硅酸盐水泥32.5级,实测28d 抗压强度为36.8Mpa ,密度为3100kg/cm 3,砂率为32%,砂表观密度2650kg/cm 3,碎石表观密度2700kg/cm 3。 (2)设计要求

混凝土强度等级C30,要求强度保证率95%,强度标准差3.0Mpa ,单位用水量选取175kg/cm 3。 (3)设计所需部分公式及参数

,0a ce cu a b ce

f W

C f f ααα?=+??,0, 1.645cu cu k f f σ

=+0.46,0.07

a b αα==

2016年上海市高考英语试卷及答案

2016年上海市高考英语试卷 I. Listening Comprehension Section A Directions: In Section A, you will hear ten short conversations between two speakers. At the end of each conversation, a question will be asked about what was said. The conversations and the questions will be spoken only once. After you hear a conversation and the question about it, read the four possible answers on your paper, and decide which one is the best answer to the question you have heard. 1.(1分)A.It is satisfactory. B.It is luxurious. C.It is old﹣fashioned. D.It is disappointing. 2.(1分)A.On August 5th. B.On August 6th. C.On August 7th. D.On August 8th. 3.(1分)A.A waiter. B.A butcher. C.A porter. D.A farmer. 4.(1分)A.In a theatre. B.In a library. C.In a booking office. D.In a furniture store. 5.(1分)A.She expected to a better show. B.She could hardly find her seat. C.She wasn't interested in the show. D.She didn't get a favourable seat. 6.(1分)A.The woman often eats out for breakfast.

信号与系统期末考试试题(有答案的)

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

2016年高考英语试题及答案(全国卷I)

2006年普通高等学校招生全国统一考试 英语(全国卷1) 本试卷分第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分。第Ⅰ卷1至12页。第Ⅱ卷13至14页。考试结束,将本试卷和答题卡一并交回。 第Ⅰ卷 注意事项: 1.答题前,考生在答题卡上务必用黑色签字笔将自己的姓名、准考证号填写清楚,并贴好 条形码。请认真核准条形码上的准考证号、姓名和科目。 2.每小题选出答案后,用2B铅笔把答题卡上对应题目的答案标号涂黑,如需改动,用橡 皮擦干净后,再选涂其他答案标号,在试题卷上作答无效。 第一部分听力(共两节,满分30分) 做题时,先将答案标在试卷上。录音内容结束后,你将有两分钟的时间将试卷上答案转涂到答题卡上。 第一节(共5小题;每小题1.5分,满分7.5分) 听下面5段对话。每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。听完每段对话后,你都有10秒的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 例:How much is the shirt? A.£19.15. B.£9.15. C.£9.18. 答案是B。 1.How much will the man pay for the tickets? A.£7.5. B.£15. C.£50. 2.Which is the right gate for the man’s flight? A.Gate 16. B.Gate 22. C.Gate 25. 3.How does the man feel about going to school by bike? A.Happy. B.Tired. C.Worried. 4.When can the woman get the computers? A.On Tuesday. B.On Wednesday. C.On Thursday. 5.What does the woman think of the shirt for the party? A.The size is not large enough. B.The material is not good. C.The color is not suitable. 第二节(共15小题;每小题1.5分,满分22.5分) 听下面5段对话。每段对话后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。听每段对话前,你将有时间阅读各个小题,每小题5秒钟;听完后,各小题将给出5秒钟的作答时间。每段对话读两遍。 听第6段材料,回答第6、7题。 6.What can we learn about Mr.Brown?

信号与系统考试试题库

精品文档 为 O 信号与系统试题库 一、填空题: 1? 计算 e (t 2) u(t) (t 3) 。 2. 已知X(s) — 士的收敛域为Re{s} 3, X(s) s 3 s 1 的逆变换为 。 3. 信号x(t) (t) u(t) u(t to)的拉普拉斯变换 为 。 4. 单位阶跃响应 g(t )是指系统对输入为 的零状态响应。 5. 系统函数为H (S ) ( 2) ; 3)的LTI 系统是稳 (s 2)(s 3) 定的,贝g H(s)的收敛域 为 。 6. 理想滤波器的频率响应为 H (j ) 2' 100 , 如果输入信号为 0, 100 7 x(t) 10cos(80 t) 5cos(120 t) , 则输出响应y(t) 则描述系统的输入输出关系的微分方程7. 因果LTI 系统的系统函数为 H(s) s 2 s 2 4s 3

精品文档8. 一因果LTI连续时间系统满足: 弟5畔6y(t) d^ 3畔2x(t),则系统的单dt d t dt dt 7 位冲激响应h(t) 为 。 9.对连续时间信号X a(t) 2sin(400 t) 5cos(600 t)进行抽 样,则其奈奎斯特频率为。 10.给定两个连续时间信号X(t)和h(t), 而x(t)与h(t)的卷积表示为y(t),则x(t 1) 与h(t 1)的卷积为 。 11.卷积积分X(t t1)* (t t2) 。 12.单位冲激响应h(t)是指系统对输入为的零状态响应。 13. e 2t u(t)的拉普拉斯变换 为。 14.已知X(s)七七的收敛域为 3 Re{s} 2 , s 2 s 3 X (S)的逆变换为 _____________________ 15.连续LTI系统的单位冲激响应h(t)满足____________________ ,贝g系统稳定。为。 17.设调制信号X(t)的傅立叶变换X(j )已知, 16.已知信号X(t) cos( 0t),则其傅里叶变换

信号与系统试题附答案精选范文

信科0801《信号与系统》复习参考练习题 一、单项选择题 (2分1题,只有一个正确选项,共20题,40分) 1、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(C ) A .400rad /s B 。200 rad /s C 。100 rad /s D 。50 rad /s 2、已知信号)(t f 如下图(a )所示,其反转右移的信号f 1(t) 是( D ) 3、已知信号)(1t f 如下图所示,其表达式是( B ) 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) 4、如图所示:f (t )为原始信号,f 1(t)为变换信号,则f 1(t)的表达式是( D ) A 、f(-t+1) B 、f(t+1) C 、f(-2t+1) D 、f(-t/2+1) 5、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 )

6。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( B ) A 、2 B 、2)2(-t δ C 、3)2(-t δ D 、5)2(-t δ 7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( B ) A 、常数 B 、 实数 C 、复数 ? D 、实数+复数 8、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 ) A 、阶跃信号 B 、正弦信号? C 、冲激信号 ? D 、斜升信号

真题安徽2016年中考英语真题及答案

))))))) 2016安徽中考英语试卷 第二部分英语知识运用(共两大题,满分45分) VI. 单项填空(共15小题;每小题1分,满分15分) 从每小题所给的A、B、C、D四个选项中选出一个可以填入空白处的最佳选项。 31. —Nice to meet you, Mr Green. I'm Sandy and this is Brad, Ken and Emily. —. A. See you later B. You're welcome C. Pleased to meet you all D. You have a point there 32. Cathy has such a good that she won many prizes in singing competitions last year. A. sleep B. idea C. voice D. time 33. Helen has got two brothers. of them likes chocolate, but she loves it. A. Neither B. None C. Each D. Any 34. When the baby dog , it was very hungry. So we gave it some food. A. is found B. was found C. has been found D. will be found 35. Mr. Black's memory is getting . As a result, he often leaves his keys at home. A. older B. poorer C. greater D. better 36. Many wild animals are , and it's time for us to do whatever we can to protect them. A. on duty B. on show C. in order D. in danger 37. Please don't make so much noise. I hear the speaker very well. A. needn't B. mustn't C. can't D. shouldn't 38. —Look at the stone bridge! Do you know it was built? A. when B. how C. where D. why 39. Don't hurry him. You will just have to be and wait until he finishes the work. A. active B. careful C. patient D. famous 40. For our own safety, it's important to the traffic rules on the way to school. A. follow B. change C. make D. break 41. I saw Sam and David in the playground yesterday afternoon. They games with their classmates then. A. play B. will play C. are playing D. were playing

2016年高考英语全国Ⅰ卷试题及答案

2016普通高等学校招生全国统一考试(新课标I) 英语试卷类型A 第Ⅰ卷 第二节(共 5 小题,每小题 2 分,满分10 分) 根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。 Secret codes (密码)keep messages private。Banks, companies, and government agencies use secret codes in doing business, especially when information is sent by computer. People have used secret codes for thousands of years. 36 Code breaking never lags(落后) far behind code making. The science of creating and reading coded messages is called cryptography. There are three main types of cryptography. 37 For example, the first letters of “My elephant eats too many eels” Spell out the hidden message “Meet me.” 38 You might represent each letter with a number, for example. Let’s number the letters of the alphabet, in order, from 1 to 26. If we substitut e a number for each letter, the message “Meet me” would read “13 5 5 20 13 5.” A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. 39 For example, “bridge” might stand for “meet” and “out” might stand for “me.” The message “Bridge out” would actually mean “Meet me.”40 However, it is also hard to keep a code book secret for long. So codes must be changed frequently. A. It is very hard to break a code without the code book. B. In any language, some letters are used more than others. C. Only people who know the keyword can read the message. D. As long as there have been codes, people have tried to break them. E. You can hide a message by having the first letters of each word spell it out. F. With a code book, you might write down words that would stand for other words. G. Another way to hide a message is to use symbols to stand for specific letters of the alphabet. 第三部分英语知识运用(共两节,满分45分) 第一节完形填空(共20小题;每小题1.5分,满分30分) 阅读下面短文,从短文后各题所给的四个选项(A、B、C 和D)中选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。 A Heroic Driver Larry works with Transport Drivers, Inc. One morning in 2009, Larry was 41along I65 north after delivering to one of his 42 .Suddenly, he saw a car with its bright lights on. 43 he got closer, he found 44 vehicle upside down on the road. One more look and he noticed 45 shooting out from under the 46 vehicle.

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

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(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

2016年中考英语真题及答案

二○一六年初中毕业暨升学考试 第I卷(选择题共55分) 一、英语知识运用(共两节,满分25分) 第一节单项填空(共15小题;每小题1分,满分15分) 从A、B、C、D四个选项中,选出可以填入空白处得最佳选项,并在答题卡上将该项涂黑。 1、My host family is taking me to ________ English film festival next weekend、 A、an B、a C、the D、不填 2、—What do you call your father’s sisters? —_______、 A、Uncles B、Cousins C、Aunts D、Parents 3、 A 100-year-old man ran a marathon in Toronto on Sunday、He became the ________ person to complete the long-distance running in the world、 A、youngest B、best C、biggest D、oldest 4、—What does your new English teacher look like? —She is a pretty lady ________ long hair、 A、at B、for C、with D、of 5、—Do you need a new dictionary, Susan? —No, Mum、My uncle bought me ________ yesterday、 A、one B、it C、the one D、another 6、My friend Frank sings well, and he is _______ good at playing guitar、 A、not B、also C、yet D、too 7、As one of the school rules, middle school students are not ________ to smoke、 A、ordered B、refused C、allowed D、forbidden 8、—Have you ever seen the movie 2012? —Yes, but I don’t believe ________ the year 2012 will see the end of the world、 A、that B、what C、how D、if 9、Some of the students are nearsighted _______ they spend too much time watching TV or playing online games、 A、when B、though C、because D、unless 10、—Excuse me, can you tell me the way to the People’s Park? —Walk along this road and turn right, and the park is on your right、You _______miss it、 A、needn’t B、mustn’t C、may not D、won’t 11、Our foreign teacher Mr Green ________ us English since three years ago、 A、has taught B、is teaching C、taught D、teaches 12、—Steve, ________do you play basketball after school? —Twice a week、It can keep me healthy、

2016年高考全国卷一英语真题及答案.doc

2016年高考全国卷一英语真题及答案 2016普通高等学校招生全国统一考试(新课标I) 英语试卷类型A 第Ⅰ卷 第一部分听力(共两节,满分30 分) 做题时,现将答案标在试卷上,录音内容结束后,你将有两分钟的时间将试卷上的答案转涂到答题卡上。 第一节(共5小题;每小题1.5分,满分7.5分) 听下面5段对话,每段对话后有一个小题。从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 例:How much is the shirt? A. £ 19. 15 B. £ 9. 18 C. £ 9. 15 答案是C。 1. What are the speakers talking about? A. Having a birthday party. B. Doing some exercise. C. Getting Lydia a gift. 2. What is the woman going to do? A. Help the man. B. Take a bus. C. Get a camera. 3. What does the woman suggest the man do? A. Tell Kate to stop. B. Call Kate,s friends. C. Stay away from Kate. 4. Where does the conversation probably take place? A. In a wine shop. B. In a supermarket. C. In a restaurant. 5. What does the woman mean? A. Keep the window closed. B. Go out for fresh air. C. Turn on the fan.

信号与系统期末考试试题

期末试题一 、选择题(每小题可能有一个或几个正确答案,将正确得题号填入[ ]内) 1.f (5-2t )就是如下运算得结果————————( ) (A )f (-2t )右移5 (B )f (-2t )左移5 (C )f (-2t )右移 2 5 (D )f (-2t )左移25 2.已知)()(),()(21t u e t f t u t f at -==,可以求得=)(*)(21t f t f —————() (A )1-at e - (B )at e - (C ))1(1at e a -- (D )at e a -1 3.线性系统响应满足以下规律————————————( ) (A )若起始状态为零,则零输入响应为零。 (B )若起始状态为零,则零状态响应为零。 (C )若系统得零状态响应为零,则强迫响应也为零。 (D )若激励信号为零,零输入响应就就是自由响应。 4.若对f (t )进行理想取样,其奈奎斯特取样频率为f s ,则对)23 1 (-t f 进行取 样,其奈奎斯特取样频率为————————( ) (A )3f s (B ) s f 31 (C )3(f s -2) (D ))2(3 1 -s f 5.理想不失真传输系统得传输函数H (jω)就是 ————————( ) (A ) 0j t Ke ω- (B )0 t j Ke ω- (C )0 t j Ke ω-[]()()c c u u ωωωω+-- (D )00 j t Ke ω- (00,,,c t k ωω为常数) 6.已知Z 变换Z 1 311 )]([--= z n x ,收敛域3z >,则逆变换x (n )为——( ) (A ))(3n u n (C )3(1)n u n - (B ))(3n u n -- (D ))1(3----n u n 二.(15分) 已知f(t)与h(t)波形如下图所示,请计算卷积f(t)*h(t),并画出f(t)*h(t)波形。

信号与系统题库(完整版)

信号与系统 题目部分,(卷面共有200题,0.0分,各大题标有题量和总分) 一、选择题(7小题,共0.0分) [1]题图中,若h '(0)=1,且该系统为稳定的因果系统,则该系统的冲激响应()h t 为。 A 、231()(3)()5t t h t e e t ε-= +- B 、32()()()t t h t e e t ε--=+ C 、3232()()55t t e t e t εε--+ D 、3232()()5 5 t t e t e t εε-- + - [2]已知信号x[n]如下图所示,则x[n]的偶分量[]e x n 是。

[3]波形如图示,通过一截止角频率为50rad s π,通带内传输值为1,相移为零的理想低通 滤波器,则输出的频率分量为() A 、012cos 20cos 40C C t C t ππ++ B 、012sin 20sin 40C C t C t ππ++ C 、01cos 20C C t π+ D 、01sin 20C C t π+

[4]已知周期性冲激序列()()T k t t kT δδ+∞ =-∞ = -∑ 的傅里叶变换为()δωΩΩ,其中2T πΩ= ;又 知111()2(),()()2T T f t t f t f t f t δ? ? ==++ ?? ? ;则()f t 的傅里叶变换为________。 A 、2()δωΩΩ B 、24()δωΩΩ C 、2()δωΩΩ D 、22()δωΩΩ [5]某线性时不变离散时间系统的单位函数响应为()3(1)2()k k h k k k εε-=--+,则该系统是________系统。 A 、因果稳定 B 、因果不稳定 C 、非因果稳定 D 、非因果不稳定 [6]一线性系统的零输入响应为(2 3 k k --+)u(k), 零状态响应为(1)2()k k u k -+,则该系统 的阶数 A 、肯定是二阶 B 、肯定是三阶 C 、至少是二阶 D 、至少是三阶 [7]已知某系统的冲激响应如图所示则当系统的阶跃响应为。 A 、(1 2.72)()t e t ε-- B 、(1 2.72)()t e t ε-+ C 、(1)()t e t ε-- D 、(1)()t e t ε-- 二、填空题(6小题,共0.0分) [1]书籍离散系统的差分方程为1()(1)(2)(1)2 y k y k y k f k --+-=-,则系统的单位序列 响应()h k =__________。

2016年陕西省中考英语试卷及答案

2016年陕西省初中毕业学业考试试题 英语试卷 第I卷(共65分) A 卷 听力部分(20分)

笔试部分 III. 单项选择(共10小题,计10分) 本题共有10个小题,请从每个小题的四个选项中,选出一个答案。 21. Good words can touch not only your heart but also . A. I B. my C. myself D. mine 22. Yesterday I saw film. It moved me deeply. A. a B. an C. the D. / 23. The dress is really beautiful, it is too small for me. A. or B. but C. so D. and 24. It?s a good idea to send the old books the children who need them. A. at B. of C. to D. by 25.- --Could you tell me it takes to walk to the Disneyland? --- About 20 minutes. A. how far B. how long C. how often D. how soon 26. you speak, your English will be. A. The less; the more B. The more; the better C. The less; the better D. The more; the less 27. Football to our school subjects last year. A. is added B. adds C. was added D. added 28. My mother a good example for me since I was young. A. was B. has been C. will be D. is 29. ---V olunteers from Lantian Saving Team have saved many travelers in the mountains.

2016年高考全国2卷英语试题及答案解析

2016高考全国II卷英语 第二部分阅读理解(共两节,满分40分) A What’s On? Electric Underground 7.30pm-1.00am Free at the Cyclops Theatre Do you know who’s playing in your area? We’re bringing you an exciting evening of live rock and pop music from the best local bands. Are you interested in becoming a musician and getting a recording contract(合同)? If so, come early to the talk at 7.30pm by Jules Skye, a successful record producer. He’s going to talk about how you can find the right person to produce your music. Gee Whizz 8.30pm-10.30pm Comedy at Kaleidoscope Come and see Gee Whizz perform. He’s the funniest stand-up comedian on the comedy scene. This joyful show will please everyone, from the youngest to the oldest. Gee Whizz really knows how to make you laugh! Our bar is open from 7.00pm for drinks and snacks(快餐). Simon’s Workshop 5.00pm-7.30pm Wednesdays at Victoria Stage This is a good chance for anyone who wants to learn how to do comedy. The workshop looks at every kind of comedy, and practices many different ways of making people laugh. Simon is a comedian and actor who has 10 years’ experience of teaching comedy. His workshops are exciting and fun. An evening with Simon will give you the confidence to be funny. Charlotte Stone 8.00pm-11.00pm Pizza World Fine food with beautiful jazz music; this is a great evening out. Charlotte Stone will perform songs

信号与系统期末考试试题

重庆大学信号与线性系统期末考试试题 一、填空题:(30分,每小题3分) 1. =-? ∞ ∞ -dt t t )()5cos 2(δ 。 2. ()dt t e t 12-?+∞ ∞ --δ= 。 3. 已知 f (t )的傅里叶变换为F (j ω), 则f (2t -3)的傅里叶变换为 。 4. 已知 6 51 )(2 +++= s s s s F ,则=+)0(f ; =∞)(f 。 5. 已知 ω ωπδεj t FT 1 )()]([+=,则=)]([t t FT ε 。 6. 已知周期信号 )4sin()2cos()(t t t f +=,其基波频率为 rad/s ; 周期为 s 。 7. 已知 )5(2)2(3)(-+-=n n k f δδ,其Z 变换 =)(Z F ;收敛域为 。 8. 已知连续系统函数1342 3)(2 3+--+= s s s s s H ,试判断系统的稳定性: 。 9.已知离散系统函数1.07.02 )(2+-+=z z z z H ,试判断系统的稳定性: 。 10.如图所示是离散系统的Z 域框图,该系统的系统函数H(z)= 。 二.(15分)如下方程和非零起始条件表示的连续时间因果LTI 系统,

?????==+=++-- 5 )0(',2)0() (52)(4522y y t f dt df t y dt dy dt y d 已知输入 )()(2t e t f t ε-=时,试用拉普拉斯变换的方法求系统的零状态响应 )(t y zs 和零输入响应)(t y zi ,0≥t 以及系统的全响应),(t y 0≥t 。 三.(14分) ① 已知2 36 62)(22++++=s s s s s F ,2]Re[->s ,试求其拉氏逆变换f (t ); ② 已知) 2(2 35)(2>+-=z z z z z X ,试求其逆Z 变换)(n x 。 四 (10分)计算下列卷积: 1. }1,0,6,4,3{}4,1,2,1{)()(21--*=*k f k f ; 2. )(3)(23t e t e t t εε--* 。

(完整版)2016年河南省中考英语试题及答案

2016年河南省普通高中招生考试试卷 英语 注意事项: 1.本试卷共10页,七个大题,满分120分,考试时间100分钟。请用蓝、黑色水笔或圆珠笔直接答在试卷上。 2.答卷前请将密封线内的项目填写清楚。 一、听力理解(20小题,每小题1分,共20分) 第一节 听下面5段对话。每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳答案,并将其标号填入题前括号内。每段对话读两遍。( ) 1. Who is going to Canada? A. Jack. B. Chris. C. Julie. ( ) 2. When can Linda probably come to the party'? A. At 6:30. B. At 7:00. C. At 7:30. ( ) 3. What did Eric do last weekend? A. He read a book. B. He stayed at home. C. He went swimming. ( ) 4. Why does Peter look unhappy? A. Because he has a math problem. B. Because he failed in the math test. C. Because he's lost his math textbook. ( ) 5. How many people are there inthe boy's family? A. Two. B. Three. C. Four. 第二节 听下面几段对话或独白。每段对话或独白后有几个小题,从题中所给的A、B、C 三个选项中选出最佳答案,并将其标号填入题前括号内。每段对话或独自读两遍。 听下面一段对话,回答第6至第7两个小题。 ( ) 6. How doesthe womanlike dogs? A. They are noisy. B. They are peaceful. C. They are easy to train. ( ) 7. What will the woman have as a pet? A. A cat. B. A dog. C. A bird. 听下面一段对话,回答第8至第9两个小题。 ( ) 8. Where is the woman going? A. To the bus station. B. To the train station. C. To the airport. ( ) 9. How much does the woman pay? A. $40. B. $45. C. $50. 听下面一段独白,回答第10至第]2三个小题。 ( ) 10. How oRen does Dennis buy a new story book?

2016年高考真题——英语(全国I卷)

2016年普通高等学校招生全国统一考试I卷 英语 第一部分阅读理解(共两节,满分40分) 第一节(共15小题:每小题2分,满分30分) 阅读下列短文,从每题所给的四个选项(A、B、C和D)中选出最佳选项,并在答题卡上将该项涂黑。 A You probably know who Marie Curie was, but you may not have heard of Rachel Carson. Of the outstanding ladies listed below, who do you think was the most important woman of the past 100 years? Jane Addams(1860-1935) Anyone who has ever been helped by a social worker has Jane Addams to thank Addans helped the poor and worked for peace. She encouraged a sense of community(社区)by creating shelters and promoting education and services for people in need In 1931,Addams became the first American woman to win the Nobel Peace Prize. Rachel Carson(1907-1964) If it weren’t for Rachel Carson, the environmental movement might not exist today. Her popular 1962 book Silent Spring raised awareness of the dangers of pollution and the harmful effects of chemicals on humans and on the world’s lakes and oceans. Sandra Day O’Connor(1930-present) When Sandra Day O’Connor finished third in her class at Stanford Law School, in 1952, she could not find work at a law firm because she was a woman. She became an Arizona state senator(参议员) and ,in 1981, the first woman to join the U.S. Supreme Court. O’Connor gave the deciding vote in many important cases during her 24 years on the top court. Rosa Parks (1913-2005) On December 1,1955, in Montgomery, Alabama, Rosa Parks would not give up her seat on a

相关文档
最新文档