西交《线性代数》在线作业
西交《英语1(新录)》在线作业答案(不能保证满分,但保证及格)

西交《英语1(新录)》在线作业答案(不能保证满分,但保证及格)一、单选题(共50 道试题,共100 分。
)1.You'd sound a lot more polite if you make the request _________a question.A. in the form ofB. in terms ofC. on the basis ofD. in two minds about满分:2分2.Unfortunately, those who _________the accident cannot recall what happened. Therefore the cause of the accident remains a mystery.A. survivedB. escapedC. abandonedD. spotted满分:2分3.Our teacher is strict ______ us. He never allows us to write _____carelessly.A. with , thatB. with , suchsoC. to, such asD. to,so满分:2分4.He used to _____;I had ____ him to ____, though.A. smoking, advised, give up itB. smoke, persuade, give it upC. smoking, tried to persuade, give it inD. smoke, tried to persuade,give it up满分:2分5._________a solution to the problem of water shortage, we have to put all our efforts together.A. To work outB. Working outC. Work outD. Being worked out满分:2分6.I was not ______ tired and couldn’t go any further.A. a littleB. littleC. bitD. a bit满分:2分7.To postpone _________the debt will ruin our business reputation.A. payingB. to payC. payD. paid满分:2分8.The professor thought that I was making good progress in my studies and told me to _________my good work.A. keep upB. go ahead withC. hold backD. come up with满分:2分9.Mrs. Newman hurried home after work, only _________both her kids gone for the movie.A. findingB. foundC. to findD. having found满分:2分10.It is a huge task to _________all the rooms in the building in such a short time.A. go ahead withB. keep upC. clean upD. work out满分:2分11.I had no______ in the decision; I had nothing to do with it.A. shareB. sharesC. sharingD. shared满分:2分12.Why not _________to professor Smith for advice? He is an expert in this field.A. goB. your goingC. to goD. you go满分:2分13.Taiwan lies ______ the southern coast of China, and it’s really _____ island. Is that so?A. in, aB. in, anC. on ,anD. off ,an满分:2分14.I really don’t want to go to the party, but I don’t see how I can ____it?A. get back fromB. get out ofC. get awayD. get off满分:2分15.Please tell it as it is.I don’t like ______ .A. to be liedB. tolie toC. being lied toD. being lied满分:2分16.The meeting was _________by the National Association of Women for the purpose of furthering the women's liberation movement.A. chairedB. sponsoredC. participatedD. assigned满分:2分17.The birth rate in a city _________to fall as its gross domestic product (GDP) rises steadily.A. estimatesB. anticipatesC. assumesD. tends满分:2分18.Catching sight of her old friend Tom, Lucy _________for him to come over and sit in a seat next to her.A. movedB. swayedC. signaledD. twisted满分:2分19.The director seems to have _________new ideas. His recent productions are nothing but copies of his old films.A. fallen short ofB. lost touch withC. come up withD. run out of满分:2分20.Because my TV set _________I could not watch the football game broadcast live last night.A. broke upB. broke offC. broke downD. broke out满分:2分21.The village was so quiet that they did not anticipate _________any trouble.A. meetingB. to meetC. to be metD. being met满分:2分22.Read the book carefully _________you'll find lots of information related to our research.A. ifB. orC. soD. and满分:2分23.Because of the mist, none of those who saw the flying objects could tell its _________shape.A. steadyB. likelyC. preciseD. rigid满分:2分24.The kids lay face down on the beach, their backs _________to the sun.A. exposingB. exposedC. having exposedD. were exposing满分:2分25.The box was ______ to carry for me.A. much too heavyB. too much heavyC. heavy too muchD. too heavy much满分:2分26._________in mind as well as in body, the child needs more than medical care.A. SickB. Be sickC. Because sickD. For sick满分:2分27.Don’t mention that at the beginning of the st ory, or it may ____ the shocking ending.A. give awayB. give outC. give upD. give off满分:2分28.The shirt is _________in small, medium and large sizes.A. originalB. visibleC. availableD. delicate满分:2分29.The negotiators believe that it is _________both parties to establish a joint venture in Shanghai.A. in the interest ofB. in response toC. for the reference ofD. grateful to满分:2分30.How to create enough jobs for the laid-off workers is a(n) _________problem for which there is no simple solution.A. complexB. internalC. emergencyD. delicate满分:2分31.They hope to_____ signs asking tourists not to step on the grass.A. put downB. put outC. put upD. put off满分:2分32.If we had adequate time to prepare, the results _________much better.A. would beB. wereC. had beenD. would have been满分:2分33.The representatives _________their discussion after the coffee break.A. jammedB. undertookC. skippedD. resumed满分:2分34.I take pride in being an independent thinker in full possession of my critical _________.A. functionB. facultiesC. judgmentD. abilities满分:2分35.Excuse me for interrupting, ______ I have some good news to tell you.A. soB. andC. butD. yet满分:2分36.Always_____ when you _____!A. answered, speak toB. answer, are spoken toC. answering, are spoken toD. answer , speak to满分:2分37.Who would you rather _______ with you, Peter or _____?A. went, meB. have gone , meC. have to go, ID. have gone ,I满分:2分38.Many people are still unwilling to buy on credit. The idea of spending money before one earns it _________among the Chinese.A. has not yet taken holdB. has not yet put acrossC. has passed awayD. has not yet fitted into满分:2分39.Is ______ at its best in spring?A. natureB. the natureC. a natureD. natures满分:2分40.Sports is not just for fun or exercise. It is also good for _________building.A. capacityB. reputationC. confidenceD. character满分:2分41.The doctor gave me some medicine,______ three times a day.A. taken offB. to be takenC. taking overD. to take满分:2分42.It won't take long to _________the situation. But I need some more time before I come up witha plan to solve the problem.A. sum upB. size upC. figure outD. wipe out满分:2分43.No matter how much money there is it can’t _____ a healthy body.A. compareB. fitC. defeatD. match满分:2分44.During the war there was a severe food shortage. It was not unusual that even the well-to-do families had to _________meat for days.A. do withB. do withoutC. turn awayD. turn in满分:2分45.The milk smells _________sour.A. as if it isB. like it isC. as if it wasD. like it was满分:2分46.The ______ look on Miss Wang’s face suggested that she______ great danger.A. worrying, is inB. worried ,was inC. worrying, wasD. worried, is with满分:2分47.It's one thing to communicate with your friends on the phone, but it is quite another to _________a nice letter explainning the same ideas.A. conveyB. distributeC. inquireD. compose满分:2分48.There was a terrible noise _______ the sudden burst of light.A. followedB. followingC. to be followedD. be followed满分:2分49.In the discussion some students in our group _____a new way of protecting the environment.A. came acrossB. came up withC. came onD. came in满分:2分50.The cost of this building _________to be over a million.A. is estimatedB. estimatesC. has estimatedD. having been estimated满分:2分答案:AAADA BCACC BCBBA CDBAC BDCAA AACBA CDABB BCAAD BBDCA BABBA。
西交《电力拖动自动控制系统》在线作业满分答案

西交《电力拖动自动控制系统》在线作业试卷得分:100一,单选题1. V-M系统的四象限运行中,正向制动时()。
A. 电枢端电压极性为负B. 电枢电流极性为正C. 机械特性在第二象限?正确答案: C2. 下面说法正确的是( )。
A. 如果给定电压不变,调节测速反馈电压的分压比不能够改变转速B. 如果给定电压不变,调节测速反馈电压的分压比不一定能改变转速C. 如果给定电压不变,调节测速反馈电压的分压比能够改变转速?正确答案: C3. 调速范围是指( )。
A. 生产机械要求电动机提供的最高转速和最低转速之比叫做调速范围B. 生产机械要求电动机提供的最低转速和最高转速之比叫做调速范围C. 生产机械要求电动机提供的平均转速和最低转速之比叫做调速范围D. 生产机械要求电动机提供的最高转速和平均转速之比叫做调速范围?正确答案: A4. 一下哪些是转速单闭环调速系统的基本特点( )。
A. 只用比例放大器的反馈控制系统,其被调量仍是无静差的。
B. 反馈控制系统的作用是:抵抗扰动,服从给定。
扰动性能是反馈控制系统最突出的特征之一C. 系统的精度只依赖于给定的精度D. 系统的精度只依赖于反馈检测的精度?正确答案: B5. 有关恒压恒频正弦波供电时异步电动机的机械特性正确的是( )。
A. 当s很小时,转矩近似与s成正比,机械特性是对称于原点的一段双曲线B. 当s很小时,转矩近似与s成反比,机械特性是一段直线C. 当s接近于1时,转矩近似与s成反比,这时,Te = f(s)是对称于原点的一段双曲线D. 当s接近于1时,转矩近似与s成正比,这时,Te = f(s)是对称于原点的一段双曲线?正确答案: B6. V-M系统的四象限运行中,正向运行时()。
A. 电枢端电压极性为正B. 电枢电流极性为负C. 机械特性在第二象限?正确答案: A7. 某闭环调速系统的调速范围是1500~150r/min,要求系统的静差率<2%,开环系统的静态速降是100r/min,则闭环系统的开环放大倍数应有多大( )。
14秋西交《《微机原理与接口技术》在线作业答案

西交《微机原理与接口技术》在线作业
一、单选题(共40 道试题,共80 分。
)
1. 对以下类型的中断,优先级最低的是()
A. 指令中断
B. 非屏蔽中断
C. 可屏蔽中断
D. 断点中断
正确答案:C 满分:2 分得分:2
2. n+1位有符号数x的补码表示范围为()。
A. (-2n<x<2n)
B. -2n≤x≤2n-1
C. -2n-1≤x≤2n-1
D. -2n<x≤2n
正确答案:B 满分:2 分得分:2
3. 8086/8088指令OUT80H,AL表示()
A. 将80H送给AL
B. 将80H端口的内容送给AL
C. 将AL的内容送给80H端口
D. 将AL内容送给80H内存单元
正确答案:C 满分:2 分得分:2
4. 在一个项目或产品研制的过程中,通常采用________类型的存储芯片来存放待调试的程序。
()
A. RAM
B. ROM
C. PROM
D. E2PROM
正确答案:D 满分:2 分得分:2
5. 输入/输出指的是主机与()交换数据
A. 存储器
B. 外设
C. 键盘
D. 显示器
正确答案:B 满分:2 分得分:2
6. 8255的A口工作在方式1输入时,其中断允许控制位INTE的开/关是通过对的按位置位/复位操作完成的。
()
A. PC0
B. PC2
C. PC4
D. PC6
正确答案:C 满分:2 分得分:2
7. 在8086宏汇编过程中不会产生指令码,只用来指示汇编程序如何汇编的指令是()
A. 汇编指令
B. 伪指令。
14秋西交《电机学(高起专)》在线作业答案

西交《电机学(高起专)》在线作业一、单选题(共20 道试题,共80 分。
)1. 一台变压器进行空载实验,当高压侧加额定电压或低压侧加额定电压分别进行测量,所得空载损耗()。
A. 前者大B. 后者大C. 相等D. 不能这样测正确答案:C 满分:4 分得分:42. 若要改变并励直流发电机的电枢两端的正负极性,则采用的方法应为()。
A. 改变励磁绕组的接线B. 改变电枢绕组接线C. 改变原动机的转向D. 即改变原动机转向又改变励磁绕组的接线正确答案:D 满分:4 分得分:43. 一台三相变压器,SN=20kV A,U1N/U2N=1000/400V,Y,d接法,当此变压器额定运行时,二次侧的每相电流值为()A. 50AB. 28.87AC. 16.67A正确答案:C 满分:4 分得分:44. 若在启动笼型异步电动机时,定子绕组中外串电阻增大时,则Tst和Ist分别为()A. 增大,减小B. 减小,增大C. 减小,减小D. 增大,增大正确答案:C 满分:4 分得分:45. 三相交流电机的定子合成磁势为圆形旋转磁势,其幅值表达式中的电流I1为()A. 每相电流的最大值B. 每相电流的有效值C. 线电流D. 三相电流的代数和正确答案:B 满分:4 分得分:46. 某一台三角形接线的交流电机的定子对称三相绕组,当点机运行时有一相绕组断线时,产生的基波磁势性质是()磁势。
A. 椭圆形旋转B. 脉振C. 圆形旋转正确答案:A 满分:4 分得分:47. 直流发电机电刷在与位于几何中线上的导体相接触的位置,若磁路不饱和,这时电枢反应是()。
西交《电机学(高起专)》在线作业15春满分答案

西交《电机学(高起专)》在线作业
1. 同步电机与无穷大电网并联运行,有功功率一定,调节励磁时,在()情况下同步电机的电枢电流最小。
A. 过励
B. 正常励磁
C. 欠励
D. 励磁电流最小
正确答案:B 满分:2 分得分:2
2. 两台容量不同、变比和连接组别相同的三相变压器并联运行,则变压器所分担的容量之标幺值()
A. 与短路阻抗成正比
B. 与短路阻抗成反比
C. 与短路阻抗标幺值成正比
D. 与短路阻抗标幺值成反比
正确答案:D 满分:2 分得分:2
3. 由定子对称三相绕组产生的次空间谐波磁动势,旋转速度()
A. 等于零
B. 是基波磁场转速的ν倍
C. 等于基波磁场转速
D. 是基波磁场转速的1/ν倍
正确答案:D 满分:2 分得分:2
4. 在直流并励发电机自励建压过程中,发现接在电枢两端的电压表的读数有减小现象,最后为零,这说明()
A. 励磁回路电阻太小
B. 励磁回路电阻太大
C. 没有剩磁或剩磁太弱
D. 电枢绕组与励磁绕组建立的磁场极性相反
正确答案:D 满分:2 分得分:2
5. 感应电动机运行时,在空间上定子绕组产生的旋转磁场转速()转子绕组产生的旋转磁场的转速。
A. 大于
B. 小于
C. 等于
D. 可能大于也可能小于
正确答案:C 满分:2 分得分:2
6. 要消除三相绕组中的齿谐波磁动势,一般可以采用()
A. 短距绕组
B. 分布绕组
C. 斜槽
D. 无法消除
正确答案:C 满分:2 分得分:2
7. 变压器在负载运行时,建立主磁通的激磁磁动势是()
A. 一次绕组产生的磁动势。
19秋西交《机械精度设计》在线作业答案(推荐文档)

西交作业答案网1.保证互换性生产的基础是()。
A.标准化B.生产现代化C.大批量生产D.协作化生产2.基本偏差代号f的基本偏差是()。
A.ESB.EIC.esD.ei3.f30g6与f30g7两者的区别在于()。
A.基本偏差不同B.下偏差相同,而上偏差不同C.上偏差相同,而下偏差不同D.公差值相同4.一般配合尺寸的公差等级范围为()。
A.IT1~IT7B.IT2~IT5C.IT5~IT13D.IT8~IT145.当相配孔、轴既要求对准中心,又要求装拆方便时,应选用()。
A.间隙配合B.过盈配合C.过渡配合D.间隙配合或过渡配合6.形位公差带的形状决定于()A.形位公差特征项目B.形位公差标注形式C.被测要素的理想形状D.被测要素的理想形状、形位公差特征项目和标注形式7.在图样上标注形位公差要求,当形位公差前面加注Φ时,则被测要素的公差带形状应为()。
A.两同心圆B.圆形或圆柱形C.两同轴线圆柱面D.圆形、圆柱形或球形8.径向全跳动公差带的形状和()公差带的形状相同。
A.同轴度B.圆度C.圆柱度D.位置度9.某实际被测轴线相对于基准轴线的最近点距离为04mm,最远点距离为08mm,则该实际被测轴线对基准轴线的同轴度误差为()。
A.04mmB.08mmC.012mmD.16mm10.矩形花键联结采用的基准制为()。
A.基孔制B.基轴制C.非基准制D.基孔制或基轴制11.最大实体尺寸是指()。
A.孔和轴的最大极限尺寸B.孔和轴的最小极限尺寸C.孔的最小极限尺寸和轴的最大极限尺寸D.孔的最大极限尺寸和轴的最小极限尺寸12.尺寸公差与形位公差采用独立原则时,零件加工后的实际尺寸和形位误差中有一项超差,则该零件()。
A.合格B.尺寸最大C.不合格D.变形最小13.公差原则是指()。
A.确定公差值大小的原则B.制定公差与配合标准的原则C.形状公差与位置公差的关系D.尺寸公差与形位公差的关系14.被测要素的尺寸公差与形位公差的关系采用最大实体要求时,该被测要素的体外作用尺寸不得超出()。
14秋西交《社会学概论》在线作业答案

西交《社会学概论》在线作业
一,单选题
1. ()不是通过语言媒介,而是通过其他符号进行的交流。
A. 非语言交流
B. 肢体交流
C. 姿态语言
D. 体态语言
?
正确答案:A
2. 以下哪种活动属于社会交往()
A. 朋友谈心
B. 观众看电影
C. 顾客的摩肩擦背
D. 乘客之间前拥后挤
?
正确答案:A
3. 在软控制手段当中,()对社会行为的约束力最强。
A. 社会舆论
B. 社会组织
C. 道德
D. 社会理想
?
正确答案:C
4. 最早传入中国的社会学理论源于()
A. 孔德
B. 马克思
C. 斯宾塞
D. 舍勒
?
正确答案:C
5. ()进一步排除了兄弟姐妹之间的婚姻关系,实行族外通婚,一个血缘中的众兄弟和另一个血缘中的众姐妹结成夫妻集团。
A. 血婚家庭
B. “普路那亚”家庭
C. 偶婚家庭
D. 一夫一妻制家庭
?
正确答案:B。
西交20春《无机化学》在线作业1参考答案

A.2
B.4
C.6
D.8
答案:B
27.给病人换药时,为了避免引起疼痛,通常用与组织细胞液()的生理盐水冲洗伤口。
A.高渗
B.低渗
C.等渗
D.蒸馏水
E.其他都可以
答案:C
28.溶胶稳定的主要因素是()
C.0.4 mol/L葡萄糖溶液与0.2 mol/LCaCl2溶液
D.0.12 mol/LCaCl2溶液与0.18 mol/L NaCl溶液
E.0.5mol/LC6H12O6溶液/0.5mol/L NaCl溶液
答案:D
7.用半透膜将0.02 mol?L-1蔗糖溶液和0.02 mol?L-1 NaCl溶液隔开时,将会发生的现象是()
答案:D
16.等渗溶液应是()
A.同一温度下,溶液的质量浓度相等的两溶液
B.物质的量浓度相等的两溶液
C.溶质的物质的量相等的两溶液
D.同一温度下的两种溶液
E.同一温度下,渗透浓度相等的两种溶液
答案:E
17.今有反应:A+B=C,其速率方程式为:u=kCACB,下列说法正确的是()
A.这反应一定是基元反应
C.9.0g/LNaCl(Mr=58.5)
D.112g/LC3H5O3Na(乳酸钠,Mr=80)
答案:D
14.某溶液中[OH-]=1.0×10-5 mol·L-1,则该溶液的pH为( )
A.5
B.10
C.9
D.6
答案:C
15.红细胞在高渗溶液中将会发生( )
A.溶胀
B.溶血
C.保持原形
D.皱缩
E.无变化
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(单选题)1: 设矩阵A,B,C,X为同阶方阵,且A,B可逆,AXB=C,则矩阵X=( )
A: A^-1CB^-1
B: CA^-1B^-1
C: B^-1A^-1C
D: CB^-1A^-1
正确答案: A
(单选题)2: 设A是n阶方阵,若对任意的n维向量x均满足Ax=0,则( )
A: A=0
B: A=E
C: r(A)=n
D: 00
B: 存在n阶矩阵P,使得A=PTP
C: 负惯性指数为0
D: 各阶顺序主子式均为正数
正确答案: D
(单选题)15: 用一初等矩阵左乘一矩阵B,等于对B施行相应的( )变换
A: 行变换
B: 列变换
C: 既不是行变换也不是列变换
正确答案: A
(单选题)16: 若n阶矩阵A,B有共同的特征值,且各有n个线性无关的特征向量,则( ) A: A与B相似
B: A≠B,但|A-B|=0
C: A=B
D: A与B不一定相似,但|A|=|B|
正确答案: A
(单选题)17: 已知三阶行列式D中的第二列元素依次为1,2,3,它们的余子式分别为-1,1,2,D 的值为( )
A: -3
B: -7
C: 3
D: 7
正确答案: A
(单选题)18: 设A为n阶方阵,r(A)<n,下列关于齐次线性方程组Ax=0的叙述正确的是( )
A: Ax=0只有零解
B: Ax=0的基础解系含r(A)个解向量
C: Ax=0的基础解系含n-r(A)个解向量
D: Ax=0没有解。