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网卡速率是决定网络传输速度的一个性能指标，其单位是MBps，即兆字节/秒
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相关试题
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对等网络中，计算机地位平等，没有从属关系，也没有专用的服务器和客户机
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在客户机/服务器网络中，至少有一台以上的专用服务器用来管理网络，控制网络运行
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TCP/IP是由国际标准化组织提出的一组网络协议
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通过把重要的文档、程序和文件加密，可以加强计算机的逻辑安全
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计算机网络按传输技术可以分为全双工、半双工、单工网络
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总线型拓扑结构的特点是：结构简单，扩展容易，网络中任何节点的故障都不会造成全网的故障，可靠性较高
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网际层协议UDP用来提供面向无连接的不可靠的信息传送服务
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广域网的结构复杂，一般多为网状拓扑结构
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域名从左到右网域逐级变低，高一级网域包含低一级网域
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网络中的计算机资源主要指服务器、工作站、用户计算机
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信号的电平随时间连续变化，这类信号称为模拟信号
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星型拓扑结构采用集中控制的策略，依赖于中央节点，若中央节点产生故障，则全网不能工作，因此可靠性差
【判断题】
如果多台计算机之间存在着明确的主/从关系，其中一台中心控制计算机可以控制其它连接计算机的开启与关闭，那么这样的多台计算机系统就构成了一个计算机网络
【判断题】
防火墙系统是一种网络安全部件，它可以用纯软件实现
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树型网络属于分布式网络，而网状网络属于分层式网络
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SNMP是一系列协议组和规范，它们提供了一种从网络上的设备中收集网络管理信息的方法
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网络系统中的软件受到偶然的因素或恶意的攻击而遭到破坏、更改，导致系统不能连续可靠正常运行，这不属于网络安全问题
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TCP/IP协议是Internet最基本的协议，是国际互联网络的基础
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计算机网络的发展经历了四个阶段，到20世纪90年代进入计算机网络高速和智能化阶段
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两台计算机利用电话线路传输数据信号时必备的设备是Modem
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网卡是局域网中连接计算机和传输介质的接口
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一个FTP服务器上只能建立一个FTP站点
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目前中国电信推荐使用的ADSL拨号用户接入方式是PPPOE
【判断题】
DDN只向用户提供永久性连接的数字数据传输通道
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非破坏性攻击一般是为了扰乱系统的运行，有时也盗窃系统资料
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在曼彻斯特编码中，每一位的中间有一跳变，位中间的跳变既作时钟信号，又作数据信号
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频分多路复用技术按频率划分为若干个子信道，一个信道中同一时间传送多路信号，适用于传输模拟信号
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OSI参考模型的层次从上到下的顺序依次为：物理层、数据链路层、网络层、传输层、会话层、表示层和应用层
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TCP/IP协议中规定 IP地址可分为3类
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典型的计算机网络从逻辑上可以分为两个子网：资源子网和通信子网
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环型拓扑结构是单方向传输，十分适用于光纤传输介质
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MODEM的传输速率56Kbps是指上行速率为56Kbps
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总线型拓扑结构通常采用集中式控制策略，常用的有CSMA/CD和令牌总线访问控制方法
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树型拓扑结构属于一种分层结构，它适用于分级管理和控制系统
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城域网是在一个城市范围内所建立的计算机通信网，简称MAN
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误码率是衡量数据在规定时间内数据传输精确性的指标
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同一间办公室中的计算机互连不能称之为计算机网络
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Tom is a book lover. ______ likes reading very much.
A. He B. She C. You D. It
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—May I listen to the music here, Mr. White?
—Sorry, you’d better it like that．
A. not to do B. not do to
C. dont do D. not do
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3.—Did you have a good time at Lauras birthday party?
— Yes, indeed. Its several years ________ I enjoyed myself so much.
A. when B. before C. since D. that
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4. —___________ is the Summer Palace from here?
About three kilometers away. You can take the No. 35 bus.
A. How long B. How far C. How often D. How much
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5. I was looking for a birthday gift for my mother, but I couldnt find ______ suitable.
A. anything B. something C. nothing D. everything
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6. A friend of my ____ and I are going to visit_______ next week．
A. father; Browns B. father's; Browns
C. father; the Browns D. father's; the Browns
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7. She ______ very hard since she came to our school.
A. studies B. has studied C. is studying D. studied
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8. — Who will send you to the new school, your mom or your dad?
— _______. Ill go there by myself.
A. Both B. Either C. Neither D. None
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9.—Well do what we can ____English well this term．
—It’s high time for you to work hard．
A. study B．to study C. be studied D. be studying
【单选题】
10. —I’m going to Flower Bookstore. Could you tell me ______?
— Sorry, I don’t know. I’m new here.
A. where it is B. where was it C. where is it D. where it was
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11. How do you like the dishes, Eric?
— Fantastic! Nothing tastes ________.
A. nice B. better C. terrible D. worse
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12. ______ Lin Feng has to work late, she always wears a smile on her face.
A. Because B. If C. Until D. Though
【单选题】
13.You can save money _______ you buy cheaper things.
A. before B. unless C. if D. until
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14. We will have a _________ holiday after the exam．
A. two-month B. two month’s C. two month D. two-months
【单选题】
15. —We will build an underground in Xuzhou before 2015．
— Wow, _______! Will it pass our place?
A. what an excited news B. how excited the news is
C. what exciting news D. how exciting
【单选题】
16. — Emily, here’s a dictionary．I hope it will help you in some way．
— Thank you．It’s ________ what I need．
A. almost B. still C. only D. just
【单选题】
17. —Oh．I’m hungry．Mum, can I have the hamburger on the plate?
—No．It tastes ．
A. terribly B. terrible C. good D. well
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18. —We can invite our teachers to the farewell party next Saturday.
—Yes, ______? I’ll call them at once.
A. what for B. what C. why not D. why
【单选题】
19.You can ________ ask the old man to move away to any other place because he has lived ________ here for at least sixty years．
A. hardly; alone B. hard; alone
C. hardly; lonely D. hardly; lonely
【单选题】
20.—I’m going back to see my grandparents this weekend．
—________．
A. It’s very nice of you B. You’d better hurry
C. Say goodbye to them D. Give my best wishes to them
【单选题】
21.—Why not take ____ umbrella with the sign “Made in China”? It is useful.
—What _______ good advice it is!
A. an; a B. a; a C. an; \ D. \; a
【单选题】
22. —Do you know the boy________ is sitting next to Peter?
— Yes. He is Peter’s friend. They are celebrating his ________ birthday.
A. who; ninth B. that; ninth C. /; ninth D. which; ninth
【单选题】
23. It was dark, ______ I couldnt see what was happening.
A. or B. though C. but D. so
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24.—You can use MSN to talk with Vivien on the Internet.
—I know. But can you tell me ________?
A. what I can use it B. when I can use it
C. why can I use it D. how can I use it
【单选题】
25. _______ are you going to the School Uniform Exhibition, Amy ?
To learn about different styles of school uniform.
A. What B. Where C. Which D. Why
【单选题】
( ) 26. Where does the writer of "The little Prince" come from?
A．England． B．France． C．America． D．China．
【单选题】
( ) 27. What does the prince do after the fox tells him a secret?
A．He cares more about a flower and a sheep．
B．He meets many more strange adults on other planets．
C．He realizes his love for the rose and he goes back to his planet．
D．He discovers interesting things such as a snake, other roses and a fox
【单选题】
( ) 28. What does "The little Prince" mainly talk about? It' s about _________．
A．the adult world B．the planet B -612
C．a rose and a fox D．the adventure of a young prince
【单选题】
( ) 29. What is the writer's main purpose（目的）in writing this passage？
A．To tell the readers his life story．
B．To tell people what kind of person his father was．
C．To tell the readers what present he got from his father．
D． To let people know how poor he was．
【单选题】
( ) 30. Why did the father not ask his son not to do this and do that？
A．Because he felt quite confident of his son．
B．Because he was born from a poor family．
C．Because he was a man of few words．
D．Because he didn't want to be much too strict with his son．
【单选题】
( ) 31. What would someone learn from this passage？
A．How to live by oneself． B．How to stand on one's own feet．
C．What a good father should do． D．What the self-important is like．
【单选题】
( ) 32. What may be the proper Chinese for the underlined part in the passage？
A．闲暇时光 B．学费 C．精神空虚 D．经济不足
【单选题】
( ) 33. Why did Natalie Smith pay for the six cars behind her?
A. She had seven tickets.
B. She hoped to please others.
C. She knew the car drivers well.
D. She wanted to show kindness.
【单选题】
( ) 34. Judy Foreman copied down the phrase because she ___ .
A. thought it was beautifully written
B. wanted to know what it really meant
C. decided to write it on a warehouse wall
D. wanted her husband to put it up in the classroom
【单选题】
( ) 35. Who came up with the phrase according to the passage?
A. Judy Foreman. B. Natalie Smith. C. Anne Herbert D. Alice Johnson.
【单选题】
( ) 36. What can we infer from the last paragraph?
A. People should practice random kindness to those in need.
B. People who receive kindness are likely to offer it to others.
C. People should practice random kindness to strangers they meet.
D. People who receive kindness are likely to pay it back to the giver.
【单选题】
( ) 37.The greatest river for navigation is ___________.
A. the Nile B. the Amazon C. the Mekong D. the Mississippi
【单选题】
( ) 38. From a dam, people can use the water for ___________.
A. keeping the rivers clean B. only making electricity
C. irrigation and making electricity D. washing clothes
【单选题】
( ) 39. The water in the river is polluted because of _____________.
A. people's drinking water too much B. people's swimming in the river too much
C. chemicals and other materials D. people's building a dam across a river
【单选题】
( ) 40. The best title of the passage is ___________.
A. Rivers in Cities B. The importance of Rivers
C. Transportation D. Natural Resources
