四川川大网络教育试题及答案
川大-第一学期高等数学试题与答案
第一学期高等数学试题(一) 一、 1.［5分］ 设，求 。
2.［5分］ 求3.［5分］ 讨论极限4.［5分］ 函数与函数 y = x 是否表示同一函数，并说明理由。
二、 1.［6分］ 讨论数列当 时的极限。
2.［6分］ 讨论函数在 x = 0 处的可导性。
3．［6分］ 设求 。
4.［6分］ 求曲线的凹凸区间。
三、1.［8分］ 求 。
2.［8分］ 求 。
3.［8分］ 计算。
4.［8分］ 求 。
四、 ［8分］ 设试讨论f (x) 的单调性和有界性。
五、 ［8分］ 求曲线 及 x 轴所围图形绕y 轴旋转所得旋转体的体积 V 。
六、 ［8分］ A ，B 两厂在直河岸的同侧，A 沿河岸，B 离岸4公里，A 与B 相距5公里，今在河岸边建一水厂C ，从水厂到B 厂的每公里水管材料费是A 厂的倍，问水厂C 设在离A 厂多远处才使两厂所耗总的水管材料费为最省。
()3222+-=-x x x f ()2+x f 3423lim 431+-+-→x x x x x xx x sin lim→()x y arcsin sin =()()(),2,1,161212=-++=n n n n n a n ∞→n ()⎩⎨⎧<-≥=010sin x x x x x f ⎩⎨⎧==-t ttey e x 22dx yd ()()212-+=x x y ()dxx x ⎰+23sin sindx x x ⎰+33⎰xdx x x 202cos ⎰+∞-02dx xe x ()()+∞<≤+=x xx x f 012()221,-==x y x y 5第一学期高等数学试题(一)解答一、 1.［5分］，。
2.［5分］3.［5分］ 因，故原极限不存在。
4.［5分］ 函数 与函数 y = x 不表示同一函数。
因前者定义域为［-1,1］，后者定义域为［-∞，∞］。
二、 1.［6分］。
2.［6分］ 函数在 x = 0 处的左右极限不等，故f (x) 在x=0处不连续亦不可导。
2022川大网教大学英语4第二次作业
大学英语（四）第二次作业班级：22春(批次)202203学期成绩：100分一.单选题（共40题,96.0分）1- I'd like to book a room, please.- _______A、Single or double?B、Good or bad?C、Which room?D、We don't have books here.我的答案：A得分：2.4分2-Hello! Can I get a seat on the 8 pm flight to Detroit? - _______A、Hello! International AirlineB、You'd better look up the schedule firstC、I'm sorry, but it's completely bookedD、I'm afraid you have to change我的答案：C得分：2.4分3- What time is the next flight to Washington? - _______A、It’s a smaller one.B、It’s too late .C、It’s 1.45 pm.D、It sounds good.我的答案：C得分：2.4分4- Passport, please?- _______A、It is here.B、What do you want?C、Here you are.D、No, you can’t.我的答案：C得分：2.4分5- I didn't know my identity card(身份证)was needed, sir. - ______A、That's sorry.B、I don't believe you.C、Sorry, but that's no excuse.D、You can't say that.我的答案：C得分：2.4分6— Oh dear! I've just broken a window.— _______! It can't be helped.A、GreatB、Never mindC、That's fineD、Not at all我的答案：B得分：2.4分7- What do you think of this novel? - _______A、I've read it.B、It's well-written.C、It was written by my uncle.D、I bought it yesterday.我的答案：B得分：2.4分8- Excuse me, how much is the jacket? - It's 499 Yuan. _______A、Oh, no. That's OK!B、How do you like it?C、Which do you prefer?D、Would you like to try it on?我的答案：D得分：2.4分9- Hello, I would like to open an account.- _______A、Which account do you want to see?B、Have you make up your mind?C、What kind of account do you have in mind?D、You’re welcome.我的答案：C得分：2.4分10- Would you please show me your bankbook? - _______A、Sorry, I have no idea.B、Here you are.C、Come with me.D、Yes, I'd like to.我的答案：B得分：2.4分11- I feel sick.- _______- I'm not sure, but I have got a bad headache.A、I'm sorry to hear that.B、How are you feeling now?C、Do you have a high temperature?D、How long have you been away?我的答案：C得分：2.4分12- Must we hand in our homework now?- _______A、Yes, you will.B、Yes, you mustn’t .C、No, you needn’t.D、No, you mustn’t.我的答案：C得分：2.4分13-Excuse me. Is this table taken?-______A、We haven't booked the dishesB、We haven't ordered the dishesC、Yeah. I'm saving these seats for friendsD、Yeah. I'm hungry我的答案：C得分：2.4分14-Let me see inside your carry-on bag. - _______A、Just a few personal belongings.B、You have no right.C、It’s my privacy.D、Is it necessary?我的答案：A得分：2.4分15If he _______, he would have signed his name in the cornerA、painted that pictureB、paints that pictureC、would have painted that pictureD、had painted that picture我的答案：D得分：2.4分16It’s already 5 o’clock. Don’t you think it’s about time _______?A、we are going homeB、we go homeC、we went homeD、we can go home我的答案：C得分：2.4分17It has been proposed that we _______ our decision until the next meetingA、delayedB、delayC、can delayD、are to delay我的答案：B得分：2.4分18I wish I _______ what to doA、knewB、have knownC、knowD、would know我的答案：A得分：2.4分19Not until I began to work _______ how much time I had wastedA、didn’t I realizeB、did I realizeC、I didn’t realizedD、I realized我的答案：B得分：2.4分20His answer is not correct, and _______A、neither am IB、either is mineC、neither is mineD、mine is neither我的答案：C得分：2.4分21Hardly _______ the railway station when the train startedA、did I reachB、had I reachedC、I reachedD、I had reached我的答案：B得分：2.4分22She suffered temporary loss of _______ after being struck on the headA、viewB、visionC、eyeD、illusion我的答案：B得分：2.4分23The company’s move to new offices is _______A、in turnB、in effectC、in natureD、in process24- _______ I take the newspaper away?- No, you mustn't. You _______ read it only here.A、Must; canB、May; canC、Need; mustD、Must; must我的答案：B得分：2.4分25This is the third week _______ the dustmen haven’t come fo r the rubbishA、thatB、whenC、whichD、on which26With the _______ of Mary, all the girl students are eager to go to the partyA、exhibitionB、exceptionC、exceptD、reception我的答案：B得分：2.4分27You needn't make such a funny noise, _______?A、don't youB、doesn't itC、need youD、need it我的答案：C得分：2.4分28Sorry, I don't know he is a friend of ________A、your brotherB、your brothersC、your brother's friendD、your brother's我的答案：D得分：2.4分29_______ they met each other and became good friendsA、It was in the countryside whereB、Being in the countrysideC、It was in the countryside whenD、It was in the countryside that我的答案：D得分：2.4分30It _______ a retired worker that she was brought up after her mother’s death.A、isB、wasC、areD、were我的答案：B得分：2.4分31The man, together with two girls, _______ by the policeA、has arrestedB、was arrestedC、are arrestedD、have arrested我的答案：B得分：2.4分32- Do you want to wait?- Five days _______ too long for me to wait.A、wasB、wereC、isD、are我的答案：C得分：2.4分33A number of people _______ at the street cornerA、amB、isC、areD、be我的答案：C得分：2.4分34Neither the students nor the teacher _______ got the right answerA、haveB、hasC、isD、are我的答案：B得分：2.4分35Only after I had reached the supermarket _______ that I had forgotten to take my purse with meA、I had realizedB、I realizedC、I have realizedD、did I realize我的答案：D得分：2.4分36Physics _______ always my strong pointA、isB、areC、beingD、to be我的答案：A得分：2.4分37You'd better wear more clothes. It's ______ cold todayA、much tooB、too muchC、very muchD、much very我的答案：A得分：2.4分38Her reaction to the child’s bad behavior was unnecessarily _______A、abundantB、fluencyC、rationalD、hash我的答案：D得分：2.4分39I won’t make the _______ mistake next timeA、likeB、sameC、nearD、similar我的答案：B得分：2.4分40There is an old saying that husbands and wives start to look and behave like each other after a time. I don't know if this was true of my mother and father.Both of my parents had brown hair and brown eyes and low voices. My father, ______, was eight years older than my mother and taller and thinner. He was built as straight as an arrow. Mymother was shorter and had a rounder and fuller face and she looked as soft as a pillow.My mother was quieter and talked less than my father did. She was also a much more patient person than my father. My father was more experienced in life. He was ______ to doing everything quickly. My mother, on the other hand, worked and spoke more slowly.They were fond of nature and sports, such as walking, gardening and swimming. They were both ______ in reading and music, but my father preferred history books, while my mother liked to read romantic novels. In music, their types were similar, and they were never proud of listening to it. Most of the time they were in agreement on bringing ______ their children. They both believed in giving them love and neither one believed in punishing them physically. At times, their personalities were very much alike, but at other times, they seemed very ______. Perhaps that is why none of their children knows which parent he looks or behaves like.（根据文章，将下面五个选项按照正确的顺序填在原文中）A. howeverB. interestedC. upD. usedE. differentA、ABDECB、ADBCEC、CDABED、BACED我的答案：B得分：2.4分二.阅读理解（共1题,4.0分）1In 1920, barely out of his teens, Alfred Hitchcock went to work for an American film company which had opened astudio in Islington, London. His first job at the studio was writing captions （脚本） for silent movies. Within two years, he was writing scripts（剧本） and working as an assistant director. For the rest of the 1920s, Hitchcock worked on one film after another in Britain and Germany. Filming was often arough-and-ready（匆忙做成的） affair and the assistant directormissing, Hitchcock became a cameraman. A scene needed rewriting, Hitchcock rewrote it. Someone needed to be in charge of money when the film crew was on location, Hitchcock looked after the money.At the same time, this being the era of silent movies, Hitchcock was learning the language of cinema: telling a story －not through dialogue, but through visual images（视觉影象）. This led to his success later.When he began to direct his own films, first in Britain and later in Hollywood, he was determined to make films that held the audience's attention and kept tension（紧张感）. He succeeded. Hitchcock's ability to put you on the edge of your seat makes him one of the greatest makers of suspense（悬念） movies.（以下为试题题干）(1) [判断题]※Alfred Hitchcock's first job at the studio was writing captions for silent movies.(2) [判断题]※According to the context, "step in and plug gaps" (in Line 3, Para. 2) means asking for one's help.(3) [判断题]※Telling a story through dialogue prepared Hitchcock for his success later.(4) [判断题]※He was determined to draw the audience's attention and keep tension in his film-making.(5) [判断题]※He had taken up different jobs before he succeeded.。
川教版 网络技术应用 模块 样题
选修3：《网络技术应用》模块样题中稿说明：1．网络技术模块的题型结构是：（1）单项选择题，共5题，共计5分。
（2）多项选择题，共2-3题，共计2-3分。
（3）填空题，共5题，共计5分。
（4）判断题，共3-2题，共计3-2分。
（5）操作题，共X题，共计35分。
2.《网络技术应用》模块：（1）因特网应用占15%，分值15分；（2）网络技术基础占15%，分值15分；（3）网站设计与评价占20%，分值20分。
3.试题难易比例（1）容易题约占60%。
（2）中等难度题约占30%。
（3）较难题约占10℅。
4．本样题具体分为单项选择题、多项选择题、填空题、判断题、操作题五大类,其中单项选择题共5小题,每小题1分,共5分；判断题共3小题,每小题1分,共3分；多项选择题共2小题，每小题1分共2分；填空题5个小题，每题1分，共5分；操作题共3小题，共35分。
（本试题要求：总分50分，考试时间中等生大概20分钟能够完成，要求90%左右的考生及格率，30%左右良好率，20%左右优秀率。
）一、单项选择题（共5小题,每小题1分,共5分）1．搜索引擎按其检索机制可以分为。
（A）关键词搜索引擎、目录搜索引擎、分层搜索引擎（B）全文搜索引擎、目录搜索引擎、元搜索引擎（C）关键词搜索引擎、分层搜索引擎、元搜索引擎（D）全文搜索引擎、分层搜索引擎、目录搜索引擎参考答案：B难度：易说明：考查搜索引擎的分类体现考纲部分：因特网应用2．因特网上的电子公告栏系统简称（ A ）。
A．BBS B．Telnet C．FTP D．HTTP 参考答案：A难度：易说明：考查拓扑结构体现考纲部分：因特网应用3．下列各图，从左到右依次是。
（A）同轴电缆、双绞线、光缆、电线（B）同轴电缆、电线、光缆、双绞线（C）电线、光缆、双绞线、同轴电缆（D）电线、双绞线、光缆、同轴电缆参考答案：C难度：中说明：考查网络的传输介质体现考纲部分：网络技术基础4. 1．可以用于制作动态网页的技术有（）。
大学mooc细胞生物学(川大)期末考试答案
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C.受体返回质膜，而表皮生长因子进入溶酶体降解 D.表皮生长因子被激活，刺激细胞生长
A 正确答案： 你没选择任何选项
17
单选 (2 分)
以下哪些信号分子的受体不位于细胞内部 A.雌性激素 B.cAMP C.表皮生长因子 D.NO
C 正确答案： 你没选择任何选项
18
单选 (2 分)
不是由真核细胞构成的生物是 A.哺乳动物 B.真菌 C.酵母 D.细菌
A 正确答案： 你没选择任何选项
11
单选 (2 分)
以下哪一项对“细胞是生命活动基本单位”的理解不准确 A.细胞是联系上一代与下一代之间的桥梁 B.人体由多种细胞构成 C. 个体的生命活动与细胞关系不大 D.肌肉的收缩靠细胞完成
C 正确答案： 你没选择任何选项
12
单选 (2 分)
为了确定某种蛋白在细胞内的分布，下面最可行的方法是
22
单选 (2 分)
细胞膜中的脂分子运动频率最低的运动方式是 A.自旋运动 B.侧向运动 C.钟摆运动 D.翻转运动
D 正确答案： 你没选择任何选项
23
单选 (2 分)
脂质体是根据磷脂分子在水相中可自发形成稳定脂双层膜的现象而制备的人工膜。作为药物载体，脂质 体包裹脂溶性药物的包装部位是
A.脂质体的脂双层中 B.各选项都有可能 C.脂质体腔内 D.脂质体的表面
8
单选 (2 分) 低密度的脂蛋白颗粒（LDL）的功能是 A.把食物中的甘油酸脂和胆固醇从肠道经淋巴管输送到血液，随血液流到肝脏
青春须早为，岂能长少年。
©解忧书店，严禁转载，违者必究！
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B.把体内自身合成的胆固醇转运到肝脏 C.把血液中胆固醇带走，送到结缔组织的表面受体 D.将甘油酸脂从肝脏输出
川大21春《形势与政策》考核作业1【标准答案】
21春《形势与政策》考核作业1
试卷总分:100 得分:100
一、单选题 (共 20 道试题,共 40 分)
1.中国共产党第一次全国代表大会于年7月23日召开，而党的诞生纪念日是7月1日。
把7月1日作为党的诞生纪念日，是毛泽东于1938年5月提出来的。
A.1920
B.1921
C.1922
D.1923
答案:B
2.加强和改进党的作风建设的核心问题是。
A.开展批评和自我批评
B.理论联系实际
C.保持党同人民群众的血肉联系
D.立党为公、执政为民
答案:C
3.中国共产党历来认为，政治路线确定之后，就是决定的因素。
A.干部
B.党员
C.纪律
D.群众
答案:A
4.中国共产党选拔干部的原则是
A.革命化、年轻化、知识化、专业化
B.任人唯贤
C.以德为先
D.德才兼备
答案:D
5.党的干部特别是领导干部处理党内关系要实行“”的原则。
A.五湖四海
B.谦虚谨慎
C.严以律己
D.任人唯贤
答案:A
6.最早提出“知识分子已经是工人阶级的一部分”观点。
A.毛泽东
B.周恩来
C.刘少奇
D.邓小平。
2021秋川大网教《计算机应用基础》第一、二次作业及答案WORD文档
《计算机应用基础》第一次作业答案一、单项选择题。
本大题共50个小题，每小题2.0 分，共100.0分。
在每小题给出的选项中，只有一项是符合题目要求的。
1.第一代电子数字计算机主要用于（）( C )A.一般科研领域B.教学领域C.军事和国防领域D.文化领域2.在第一代计算机时代，编程采用（）。
( B )A.直译式语言B.机器语言和汇编语言C.混合式语言D.编译式语言3.在第二代计算机期间（1958-1964）内诞生了（）。
( B )A.机器语言B.高级语言C.数据库语言D.图像处理语言4.在第二代计算机期间（1958-1964）内诞生了（）。
( A )A.通用机和专用机B.小型机C.微型机D.便携机5.第二代计算机不仅能够处理文字，而且能够方便处理（）。
( B )A.视频信息B.图形信息C.动画信息D.语音信息6.计算机具有（A.B.C.D.7.A.查询B.工程计算C.统计D.分类8.A.高速运算能力B.逻辑判断能力C.很高的计算精度D.自动控制能力9.个人使用的微机和笔记本电脑属于（）。
( C )A.高性能计算机B.快速度计算机C.通用计算机D.专用计算机10.A.源程序B.应用程序C.用户程序D.实用程序11.（）。
( B )A.B.C.D.12.应用中的（）。
(A.文字处理B.飞机导航C.建筑物安全检测D.辅助设计13.计算机的逻辑判断能力取决于（）。
( D )A.硬件制造B.机器组装C.操作系统安装D.软件编制14.在下面的选项中，不属于计算机的一种用途分类的是（）。
( D )A.人工智能B.C.D.企业管理15. D )A.B.C.D.操作系统16.)A.RAMB.ROMC.硬盘D.软盘17.A.空格键B.退格键C.回车换行键D.换档键18.计算机的字长是计算机的主要性能指标之一，这方面的指标用（）。
( A )A.中央处理器一次可以处理的二进制位数来表示B.中央处理器一次可以处理的字节数来表示C.内存一次可以写入的十进制位数来表示D.内存一次可以读出的十六进制位数来表示19.对于信息，下列说法错误的是（）。
川大期末试题及答案
川大期末试题及答案考试题目一：计算机网络1. 什么是计算机网络？简要介绍计算机网络的定义和作用。
计算机网络是指通过通信设备和通信线路连接起来的计算机系统的集合。
它的主要作用是实现信息的传输和共享，使得人与计算机、计算机与计算机之间能够进行有效的通信和资源共享。
2. 请简述OSI（开放式系统互联）参考模型的七个层次及其功能。
（1）物理层：提供物理介质传输和传输速率的基本特性，如光纤、电缆等。
（2）数据链路层：提供点对点数据帧传输，差错控制和流量控制。
（3）网络层：负责数据包的路由和转发，实现不同网络之间的数据传输。
（4）传输层：负责数据传输的可靠性，提供端到端的数据传输服务。
（5）会话层：负责建立、管理和终止通信会话。
（6）表示层：将数据转化为适合传输的格式，进行数据加密和解密等。
（7）应用层：实现特定网络应用，为用户提供各种服务，如电子邮件、文件传输等。
3. TCP/IP协议族是当前互联网所采用的主要协议，它有哪些主要的协议组成？简述TCP和UDP协议的特点和应用场景。
TCP/IP协议族由多个协议组成，其中主要协议有IP协议、TCP协议和UDP协议。
TCP协议是面向连接的可靠传输协议，它保证数据的按序到达和不丢失，适用于要求可靠传输的应用场景，如文件传输、网页访问等。
UDP协议是面向无连接的不可靠传输协议，它不进行数据重传和顺序控制，适用于实时性要求较高，但对可靠性要求不高的应用场景，如实时视频、音频传输。
4. 请简述HTTP协议和HTTPS协议的区别，并解释HTTPS协议的工作原理。
HTTP协议是超文本传输协议，是一种基于请求-响应模式的协议，通常在普通的网络环境下进行明文传输。
HTTPS协议是在HTTP协议基础上进行加密的安全传输协议，利用SSL/TLS协议对通信内容进行加密和身份验证。
它通过使用证书对服务器和客户端进行身份验证，建立安全的通信管道，保障数据的机密性和完整性。
考试题目二：计算机操作系统1. 请简述进程和线程的概念及其区别。
川大软院计网选择题答案Chapter3(含答案)
CHAPTER 3: TRANSPORT LAYER1. A transport-layer protocol provides for logical communication between ___C_.A.RoutersB.HostsC.Application processesD.End systems2.Transport-layer protocols run in __D__.A.ServersB.ClientsC.RoutersD.End systems3.In transport layer, the send side breaks application messages into ___B_, passes to network layer.A.FramesB.SegmentsC.Data-gramsD.bit streams4.The receive side of transport layer reassembles segments into messages, passes to __A__layer.A.ApplicationworkingC.PhysicalD.MAC5.Services provided by transport layer include __C__.A.HTTP and FTPB.TCP and IPC.TCP and UDPD.SMTP6.Which of the following services is not provided by TCPDA.In-order data transfersB.Reliable data transfers and flow controlsC.Congestion controlsD.Delay guarantees and bandwidth guarantees7.These two minimal transport-layer services----___A_ and ____----are the only two services that UDP providesA.process-to-process data delivery, error checkingB.congestion control, reliable data transferC.flow control, congestion controlD.In-order data transfer, error checking8.UDP offers which of the following benefits relative to TCPCA.UDP guarantees that Individual packets of atransmission will arrive “in order”B.UDP supports a self-regulating “throttle”feature that prevents network saturationC.UDP consumes fewer computer resources by notmaintaining connection stateD.None of the above9.Which of the following applications normally uses UDP servicesBA.SMTPB.Streaming multimediaC.FTPD.HTTP10.The job of gathering data chunks, encapsulating each data chunk with header information to create segments and passing the segments to the network is called __A__.A.multiplexingB.de-multiplexingC.forwardingD.routing11.This job of delivering the data in a transport-layer segment to the correct socket is called _B___.A.multiplexingB.de-multiplexingC.forwardingD.routing12.Port number’s scope is ___B_ to ____.A.0, 1023B.0, 65535C.0, 127D.0,25513.The port numbers ranging from __C__to ____ are called well-known port number and are restricted.A.0, 127B.0, 65535C.0, 1023D.0,25514.The UDP header has only four fields, they are__A__.A.Source port number, destination port number, lengthand checksumB.Source port number, destination port number, sourceIP and destination IPC.source IP, destination IP, source MAC address anddestination MAC addressD.source IP, destination IP, sequence number and ACKsequence number15.The field of Length in UDP segment specifies the length of ___B_.A.the UDP segment, not including the headerB.the UDP segment, including the headerC.the UDP segment’s headerD.the Length field16.Which of the following about TCP connection is not correctAA.It is a broadcast connectionB.It is a point-to-point connectionC.It is a pipelined connectionD.It is a full duplex connection17.In the following four descriptions about MSS and MTU, which one is not correctCA.The MSS is typically set by MTUB.The MSS is the maximum size of the TCP segmentincluding headersC.The MSS is the maximum amount of application-layerdata in the segmentD.The MTU means the largest link-layer frame18.__A__ is the byte stream number of first byte in the segment.A.Sequence numberB.ACK numberC.ChecksumD.port number19.__B__ is the byte sequence numbers of next byte expected from other side.A.Sequence numberB.ACK numberC.ChecksumD.port number20.In the following four options, which one is correctDA.Suppose that the last SampleRTT in a TCP connectionis equal to 1 sec. Then the current value of TimeoutInterval will necessarily be≤1 secB.The timeout should be less than the connection’sRTTC.Suppose that the last SampleRTT in a TCP connectionis equal to 1 sec. Then the current value of TimeoutInterval will necessarily be≥1 secD.The variations in the SampleRTT are smoothed out inthe computation of the EstimatedRTT21.There are two 16-bit integers: 1110 0110 0110 0110, 1101 0101 0101 0101. Their checksum is__A__.A.011B.100C.111D.00022.Suppose host A sends host B one TCP segment with sequence number 418, acknowledgement number 571, and 4 bytes of data. Then the sequence number in the acknowledgement to this segment is _____C____A.422B. 418C.571 D. 57523.Because TCP only acknowledges bytes up to the first missing byte in the stream, TCP is said to provide__D__.A.positive ACKsB.Selective acknowledgementsC. 3 duplicate ACKsD.Cumulative acknowledgements24.If we define N to be the window size, base to be the sequence number of the oldest unacknowledged packet, and next-seq-num to be the smallest unused sequence number, then the interval [nextseqnum,base+N-1] corresponds to packet that __A__.A.can be sent immediatelyB.have already been transmitted and acknowledgedC.cannot be usedD.have been sent but not yet acknowledged25.Which of the following is not a pipeliningA.B.Go-Back-NC.Selective repeatD.TCP26.What is the main difference between stop-and-wait and pipelined reliable data transfer protocolBA.The pipelined protocol uses the NAK packets, whereasin the stop-and-wait protocol senders always wait for ACK packets.B.With the pipelined protocol, the sender can sendseveral packets in row, whereas in the stop-and-wait protocol the sender cannot send the packets in row.C.With the pipelined protocol, the receiver must sendone ACK for several packets (cumulative ACK), whereas in the stop-and-wait protocol the receiver can not send the cumulative ACK.D.The pipelined protocol uses timeouts, whereas thestop-and-wait protocol does not use the timeout.27.Fast retransmit means in the case that __D__ duplicate ACK-s are received, the TCP sender resend segment before timer expires.A.6B.5C.4D.328.__B__ is a speeding-matching service---matching the rate which the sender is sending against the rate at which the receiving application is reading.A.congestion controlB.flow controlC.sliding-window controlD.variable control29.TCP provides flow control by having the sender maintaina variable called the __D__.A.bufferB.Congestion windowC.Sliding windowD.Receive window30.Provided RcvBuffer = 20, LastByteRcvd = 20, LastByteRead = 15, then RcvWindow=__B__.A.14B.15C.16D.1031.In the following four descriptions about TCP connection management, which one is not correctDA.Either of the two processes participating in a TCPconnection can end the connectionB.If the FIN bit is set to 1, it means that it wantsto close the connectionC.In the first two step of the three-way handshake,the client and server randomly choose an initial sequence numberD.In the three segments of the three-way handshake, theSYN bit must be set to 132.How does TCP sender perceive congestionDA.Through a timeout eventB.Through a receiving duplicate ACK-s eventC.Both A and BD.Either A or B33.There are two states in TCP congestion control, which are _C___.A.safe start and congestion abandonB.safe start and congestion avoidanceC.slow start and congestion avoidanceD.slow start and congestion abandon34.In TCP, the timeout interval is a function of:AA.estimated RTT at the senderB.MSS and the overhead of a segmentB.the size of buffer at thereceiver D. the size of sending window35.In a TCP connection, there is timeout event when the value of threshold is 32 and the size of congestion window is 16. According to the TCP congestion control policy, the new value of threshold and the new size of congestion window should be ______C__, respectively.A.16,8 B. 24,8 C. 8,1 D. 16, 1。
四川农业大学网络教育大学英语考试测试试题
四川农业大学网络教育大学英语考试测试试题四川农业大学网络教育大学英语考试试题————————————————————————————————作者：————————————————————————————————日期：四川农业大学网络教育大学英语考试试题一、语法和词汇（共125题）1. “What will you ________ at six this evening?” “I’ll probably be having supper.”A.doB.doingC.haveD.be doing2. The river ________ to the east. It is the second longest river in the country.A.runsB.is runningC.runD.ran3. We ________ on it for many hours but we have not yet reached any conclusion.A.workB.have been workingC.are workingD.have had worked4. The doctor took my temperature and ________ to my heart.A.listensB.will listenC.has listenedD.listened5. When did you see her? What ________ then?A.was she doingB.did she doC.is she doingD.has she hone6. I ________ help. I can do it myself.A.need toB.don’t needC.needn’tD.need7. Since the road is wet, ________last night.A.it must have rainedB.it must rainC.it must be rainingD.it must have been raining8. “Must we start the experiment now?” “No, you________.”A.won’tB.needn’tC.can’tD.may not更多四川农业大学网络教育考试试题：/doc/b811787210.html,/school408/9. We all hope you ________to the party next week.A.to comeB.be able to come/doc/b811787210.html,eD.will be able to come10. Mr. Baker, a dozen students want to see you. ________ they wait here or outside?A.ShouldB.WillC.ShallD.Are11. Tennis balls ________ best in summer.A.are soldB.sellC.would be soldD.sold away12. The medicine________ cool, clean and dry.A.must keepB.must be keptC.must be keepD.must be in13. “Have you moved into the new house?”“Not yet. The rooms ________.”A.are being paintedB.are paintingC.are paintedD.are being paint14. The song ________ by children.A.is often sungB.was often sungC.singsD.has often sung15. This kind of wood ________ houses./doc/b811787210.html,ed to buildingB.are used to buildingC.is used to buildD.is used to building16. A group of ________will come to our school tomorrow.A.GermanyB.GermansC.GermanD.Japaneses17. That bottle is made of________.A.glassB.glassesC.the glassD.a pair of glasses18. There are ten ________ in our school.A.woman teachersB.women teacherC.woman teacherD.women teachers19. This piece of ________ is long enough for you to make a shirt.A.clothB.clothesC.clothingD.suit20. ________work has been done to solve the problem.A.ManyB.A great deal ofC.A great manyD.A large number of21. Last Sunday my grandma had her ________ birthday.A.ninetyB.ninetiethC.nintiesD.ninetieth’s22. English was taught at the beginning of ________ century in China.A.nineteenB.nineteenthC.the nineteenthD.the nineteen23. This kind of ________ bottle can hold a kg of milk.A.aB.theC.oneD./24. We’ll leave our school in________.A.two year and a halfB.two years and a halfC.two and half a yearsD.two and half a year25. ________is Christmas day.A.Twenty-five of DecemberB.Twenty-fifth of DecemberC.The twenty-five of DecemberD.The twenty-fifth of December26. The flowers smell ________ and look________.A.good; beautifulB.good; beautifullyC.well; beautifulD.well; beautifully27. This ladder is too long for this truck. We need ________ truck to carry it.A.a smallB.the smallC.a biggerD.a biggest28. Alice isn’t the oldest girl in her class, but she is older than________.A.any of the girlsB.any other girlC.some the other girlsD.some of the other girls29. Walking on the moon is ________ walking on the earth.A.not so easy asB.more easy thanC.as easily asD.more easier than30. Do you have ________ to say at the meeting?A.anything importantB.important somethingC.everything importantD.important anything31. “What’s in your ________ hand?” “An orange.”A.anotherB.the otherC.otherD.others32. Tom and John have arrived, but ________ students in the class aren’t here yet.A.otherB.othersC.the othersD.the other33. Some people like to stay at home on Sundays, but ________ like to go to the cinema.A.anotherB.othersC.otherD.the other34. The boy has to look after himself, because his parents ________ abroad.A.are bothB.both areC.are allD.all are35. I have four brothers. One is in Japan, ________are in Shanghai.A.anotherB.othersC.the otherD.the others36. It is still early. Why not ________ for a while?A.to play pianoB.play pianoC.do you play the pianoD.play the piano37. “Alice couldn’t answer the question, could she?” “________.”A.No, she couldn’tB.No, she couldC.Yes, she cou ldn’tD.Yes, she answers38. “________ some hot coffee now?” “Yes, please.”A.Do you likeB.Will you likeC.Would you likeD.Should you like39. He doesn’t think I will get good marks, ________?A.will IB.won’t IC.does heD.will he40. “Would you like to watch TV or listen to the radio?” “________.”A.Yes, I’d like to watch TVB.No, I do not watch TVC.Yes, to listen to the radioD.I’d like to watch TV41. ________you don’t like him is none of my business.A.WhatB.WhoC.ThatD.Whether42. He wanted to se e the film very much, ________he couldn’t get a ticket.A.butB.andC.orD.so43. Lei Lei said that she ________ her uncle the next Saturday.A.visitsB.visitedC.is visitingD.was going to visit44. There is some truth in ________ he says.A.whichB.whatC.thatD.those45. Can you tell me ________ is the nearest way to the station?A.whatB.ifC.whichD.that46. This is the man ________ last night.A.whom I saw himB.whom I sawC.which I sawD.who I saw him47. The girl________ an English song in the next room is Tom’s sister.A.who is singingB.is singingC.sangD.was singing48. Is this the hospital ________ he worked ten years ago?A.thatB.whereC.whichD.the one49. I don’t know the person ________ dancing.A.who is likingB.whoever likesC.who likesD.those who likes50. I’ll tell you ________ he told me yesterday.A.all whichB.all whatC.that allD.all51. There was ________ much noise ________ the speaker could not make himself heard.A.so; thatB.so; asC.such; thatD.so; as to52. I don’t know when he will come, but when he________, I’ll let you know.A.will come/doc/b811787210.html,esC.has comeD.is coming53. He ________to bed ________ he finished his work last night.A.don’t go; untilB.didn’t go; afterC.went; untilD.d idn’t go; till54. ________he was very tired, he still went on working hard.A.ForB.ThoughC.AsD.Since55. She pulled back the curtain ________ she could see thepassing crowd.A.so as toB.in order toC.so thatD.that so56. It’s too expensive ________ by plane. I’ll go by train instead.A.travelB.travellingC.travelsD.to travel57. Our TV set doesn’t work. I think we’ll have it ________ tomorrow.A.repairingB.repairC.repairedD.being repaired58. Think it over and you will remember ________ the word.A.how to spellB.how spellC.to spellD.to spelling59. She ran as quickly as she could so as________.A.not to lose the raceB.to not lose the raceC.don’t lose the raceD.didn’t lose the race60. Is this house large enough for us________?A.livingB.living inC.to liveD.to live in61. Neither my mother nor my father ________ Japanese.A.doesn’t teachB.don’t teachC.teachD.teaches更多四川农业大学网络教育考试试题：/doc/b811787210.html,/school408/62. Not only my sister but also Mary and John ________ interested in that film.A.amB.isC.beD.are63. ________a good thing that they didn’t come to the meeting.A.That’sB.It’sC.There’sD.That is64. The number of teachers ________ never under 100 in this school.A.isB.areC.beenD.be65. Half of the money ________ your brother.A.belong toB.belongC.belongs toD.belongs66. Police officers working on the murder have ________ hundreds of families.A.askedB.researchedC.questionedD.demanded67. Thanks, it will always ________ me of you.A.rememberB.remindC.remainD.regard68. It’s no ________ that you failed in the exam. You’re always being so careless.A.wonderB.troubleC.doubtD.matter69. When she came home she sensed something________ . Had someone got in?A.terribleB.unusualC.uncomfortableD.bad70. Something terrible ________ to him the other day.A.took placeB.happenedC.appearedD.seemed71. Look, how perfectly that tie ________ his suit!A.do withB.suitsC.matchesD.fits72. You don’t look ________ ; you’d better see a doctor.A.miceB.wellC.kindD.good。
川大《计算机网络与通信》18春在线作业1
(单选题) 1: 190.233.27.13是( )IP地址。
A: A类B: B类C: C类D: D类正确答案:(单选题) 2: 使用距离矢量路由选择协议的路由器通过以下哪种方式获得最佳路径A: 通过向相邻路由器发送一次广播以询问最佳路径B: 运行最短路径优先（SPF）算法C: 将接收到的路径的度量增加1D: 测试每条路径正确答案:(单选题) 3: 下列功能中，属于表示层提供的功能是( )。
A: 拥塞控制B: 透明传输C: 死锁处理D: 文本压缩正确答案:(单选题) 4: Web上每一个页都有一个独立的地址，这些地址称作统一资源定位器，即( )。
A: URLB: WWWC: HTTPD: USL正确答案:(单选题) 5: 下面四种答案中，哪一种属于网络操作系统( )。
A: DOS操作系统B: Windows98操作系统C: WindowsNT操作系统D: 数据库操作系统正确答案:(单选题) 6: 一条线路每1/16秒采样一次，传输信号共有16种状态，则其传输速率为( )。
A: 16bpsB: 48bpsC: 64bpsD: 256bps正确答案:(单选题) 7: 接收端不但能发现差错，而且能确定差错发生的位置从而加以纠正的差错控制方法为( )。
A: 反馈重发ARQB: 前向纠错FECC: 停止等待方法D: 选择重发方法正确答案:(单选题) 8: DNS的中文含义是( )。
A: 邮件系统B: 地名系统C: 服务器系统D: 域名服务系统正确答案:(单选题) 9: 下面对计算机网络体系结构中协议所做的描述，错误的是( )。
A: 网络协议的三要素是语法、语义和同步B: 协议是控制两个对等层实体之间通信的规则的集合C: 在OSI参考模型中，要实现第N层的协议，需要使用N+1层提供的服务D: 协议规定了对等层实体之间所交换的信息的格式和含义正确答案:(单选题) 10: OSI（开放系统互联）参考模型的最低层是( )。
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一、单项选择题。本大题共50个小题，每小题 2.0 分，共100.0分。在每小题给出的选项中，只有一项是符合题目要求的。 会计的基本职能是（ C ）。
反映和考核；
预测和决策； 核算和监督； 分析和管理 会计在进行核算时，其主要的计量单位是（ C ）。 劳动计量单位； 工时计量单位； 货币计量单位； 实物计量单位 下列哪项是会计核算的第一基本前提（ A ）。 会计主体假设； 货币计量假设； 持续经营假设； 历史成本假设 下列方法哪些不属于会计核算方法（ B ）。 成本计算； 成本分析； 复式记账； 财产清查 某企业A材料期初结存2000件，单价100元；本期购进5000件，单价100元；期末盘点数为900件。采用实地盘存制和综合加权平均法时，本期发出材料的成本为（ B ）。 600000； ； ； 500000 会计的主要方法是（B ）。 会计检查的方法； 会计核算的方法； 会计预测的方法； 会计决策的方法 会计主体是（D ）。 企业单位； 企业法人； 法律主体； 独立核算的特定单位 简单的会计分录是指（ C ）。 一借多贷的会计分录； 多借一贷的会计分录； 一借一贷的会计分录； 多借多贷的会计分录 企业的所有者权益在价值量方面等于（ B ）。 全部资产价值； 全部资产减全部负债价值； 全部资产减流动负债价值； 流动资产减流动负债价值 下列项目中不属于盘存类的账户是（C ）。 “库存现金”账户； “银行存款”账户； “在途物资”账户； “长期投资”账户 会计等式是指（ C ）。 资产=所有者权益； 资产=负债； 资产=权益； 资产=权益一所有者权益 在下列费用中可以直接记入成本的费用是（ A）。 生产工人的工资； 车间管理人员的工资； 销售人员； 厂部管理人员工资 “库存现金”账户期初余额为2,000元，本期贷方发生额1，800元，借方发生额为1，500元，则期末余额为（ B ）。 1,300； 1，700； 2，300； 2,500 将库存现金存入银行一般应填制下列哪种凭证？（D ）。 银行存款的收款凭证； 银行存款的付款凭证； 库存现金的收款凭证； 库存现金的付款凭证 账户的基本结构分左右两方，哪方记增加，哪方记减少应由（ D ）。 账户的名称决定； 账户的格式决定； 账户的结构决定； 账户的经济内容决定 采购人员出差回厂报销差旅费1,750元，交回现金100元，应编制（ D ）。 一张收款凭证； 一张付款凭证； 一张转账凭证； 一张收款凭证，一张转账凭证 下列账户期末肯定无余额的是（ A ）。 制造费用； 在途物资； 应收账款； 本年利润 配比原则是指将一个会计期间的收入和产生收入所发生的费用配比起来进行比较，从而正确的计算出（D ）。 产品成本； 产品价格； 期间费用； 当期损益 “本年利润”账户5月31日的贷方余额表示（ C ）。 企业与月份实现的利润； 企业5月31日实现的利润； 企业年初至5月份累计实现的利润； 企业年初至5月份已预分配的利润 如果记账凭证所记金额没错，所用科目错误，已登记入账，应用哪种方法更正（C ）。 划线更正法； 补充登记法； 红字冲销法； 充减登记法 下列账户按经济内容分类属于资产类的是（ B ）。 “利润分配”账户； “坏账准备”账户； “预收账款”账户； “盈余公积”账户 下列属于直接费用的是（ C ）。 在途物资费； 销售费； 直接人工费； 材料成本差异 总账、明细账的相同点是（ C ）。 试算平衡的方法相同； 登记的依据完全相同； 反映的经济业务内容相同； 提供指标的详细程度相同 借贷记账法的规则是（ D ）。 增加记借方、减少记贷方； 一借多贷； 一贷多借； 有借必有贷，借贷必相等 下列账户是调整账户的有（D ）。 “原材料”账户 “在途物资”账户 “本年利润”账户 “利润分配”账户 为检查记账的错误，需要（ C ）。 只编总账与明细账的试算平衡表； 只编总账试算平衡表； 即要编试算平衡表，又要对账； 只核对账目 汇总记账凭证核算形式循环程序是（ A ）。 根据汇总记账凭证登记总账； 根据科目汇总表登记总账； 根据转账凭证汇总表登记总账； 根据记账凭证汇总表登记总分类账 “短期借款”账户期初余额为10,000元，本期贷方发生额为8,000元，借方发生额为5,000元，则期末贷方余额为（A ）。 13,000； 3,000； 7,000； 15,000 在永续盘存制下，对存货进行清查的目的是（ D ）。 检查账证是否相符； 检查账账是否相符； 检查账表是否相符； 检查账实是否相符 某企业当月赊销产品一批，开出的增值税专用发票上注明售价5000元，增值税850元，另外以银行存款代购买方垫付运杂费50元，其“应收账款”的入账价值是（D ）。 5000； 5050； 5850； 5900 马克思指出的会计是对生产“过程的控制和观念总结”，应理解为（ D ）。 核算和总结； 控制和总结； 管理和反映； 核算和监督 下列支出哪个属于资本性支出（ A ）。 购置机器设备支出； 生产工人工资及附加费； 生活生产日常耗用的水电费； 固定资产日常修理费 企业会计期间假设是以下哪项假设为前提（ B ）。 会计主体假设； 持续经营假设； 历史成本假设； 货币计量假设 企业计提坏账准备是根据（ D ）。 一贯性原则； 客观性原则； 真实性原则； 谨慎性原则 资本性支出是指（ A ）。 支出的效益与以前会计年度相关； 支出的效益与几个会计年度相关； 支出的效益与一个会计年度相关； 支出的效益与本会计年度相关 企业为了正确划分并确定各个会计期间的财务成果，其采用的记账基础是（ B ）。 收付实现制； 权责发生制； 永续盘存制； 实地盘存制 会计科目是（ A ）。 帐户的名称； 损益表的项目； 资产负债表的项目； 财务状况变动表的项目 四柱清册的平衡关系是指（ B ） 旧管+新收+开除=实在； 旧管+新收—开除=实在； 旧管+开除=新收+实在； 旧管—开除=新收—实在 调整应收账款余额的帐户是（ D ）。 “预收帐款”账户； “预付账款”账户； “应付帐款”账户； “坏账准备”账户 下列各项目中属于流动资产的是（ A ）。 预付账款； 递延资产； 预收账款； 无形资产 在下列账户中属于集合分配的账户为（ D ）。 “管理费用”账户； “财务费用”账户； “销售费用”账户； “制造费用”账户 企业期初资产总额200,000元，负债总额140,000元，所有者权益60,000元，本期取得收入100,000元，发生费用90,000元，则期末所有者权益总额为（C ）。 170,000； 180,000； 70,000； 230,000 在下列单据中不属于原始凭证的是（ D ）。 发货单； 投料单； 借款借据； 经济合同 “累计折旧”账户余额，反映了固定资产的（ D ）。 原值； 净值； 本年损耗价值； 累计损耗价值 将会计凭证划分为原始凭证和记账凭证的依据是（ D ）。 填制凭证的时间； 填制凭证的方法； 填制凭证的内容； 填制凭证的程序和用途 下列引起资产与负债同时增加的业务是（B）。 用银行存款偿还前欠贷款； 将银行借款存入银行； 用银行存款购买原材料； 收回货款存入银行 总账、明细账能进行平行登记的原因是（ C ）。 格式相同； 登记时间相同； 经济业务内容相同； 登记的根据相同 在借贷记账法中借贷二字表示（ D ）。 资金包括的内容； 资金运动的方向； 资金的平衡关系； 资金在数量上的增加和减少 账簿按用途可分为（ A ）。 序时账、分类账、备查账； 序时账、备查账、卡片账； 明细分类账、卡片账、订本账；