更多"Modem的作用是______。"的相关试题:
[判断题]DDF专线MODEM的LIFE灯亮时表示MODEM告警。
A.正确
B.错误
无法Ping通ADSL Modem
无法Ping通ADSL Modem 怎么办？？？？
[单项选择]家里拨号上网需要使用MODEM。下面关于MODEM的说法中错误的是______。
A. 调制器完成将模拟信号恢复成数字信号的功能
B. MODEM的调制方式主要有：振幅调制、频率调制和相位调制
C. MODEM主要分为外置式、内置式、插卡式和机架式
D. MODEM的传输模式主要有：传真模式、语音模式
[单项选择]当作为RS—232接口标准中DCE设备的MODEM和作为DTE设备的计算机相连时，MODEM收到呼叫信号后向计算机发送的信号是 (24) 。
A. 载波检测
B. 振铃指示
C. DTE就绪
D. DCE就绪
[单项选择]Cable MODEM是宽带接入方式之一。下面关于Cable MODEM接入方式的叙述中，错误的是( )。
A. 它利用现有的有线电视电缆线作为传输介质
B. 它利用一根同轴电缆可以在上网的同时收看电视节目
C. 用户可以始终处于连线状态，无需像普通MODEM那样拨号后才能上网
D. 它的传输速度很快，并且不会因为同一条线路上用户数的增加而影响该线路其他用户的带宽
[单项选择]The highly efficient modem communication system began ______.
A. over a century ago
B. in the middle 1960s
C. in the late 1980s
D. in the year 1980
[单项选择]Modem machines only bring people problems.
A. Right.
B. Wrong.
C. Doesn’t say.
[单项选择]What can be concluded about "modem"
A. It converts data from one form to another.
B. It will be out of date soon.
C. It serves as a link between senders and recipients of message.
D. It transmits message more efficiently than other devices.
[单项选择]
Passage Four
Modem ideas are beginning to influence the Eskimos, but not enough to make much difference to their way of life. They still spend the winter in igloos, the round huts that are built of snow frozen hard. They still travel on sleds that are pulled by dogs. The winter is too cold for hunting, so during that season they live on the stores of seal meat that they have killed in the summer. But seal meat is not the only kind of food that they eat. In summer they hunt bears and reindeer, a type of deer With long branching horns that is used for its milk, meat and skin. They also fish all the year round. The Eskimos who are hunters in summer are fishermen in winter. In winter they make holes in the ice and catch their fish through the holes that they have made. The Eskimos are adaptable. That is why they are able to live in Arctic regions.
Which is the main topic of this passage（）
A. Modem ideas are beginning to influence the Eskimos.
B. Why are the Eskimos able to live in Arctic regions
C. The Eskimos are adaptable.
D. Eskimos' way of life has not changed very much.
[单项选择]Cable Modem上行速率在（）。
A. 64kb/s～200kb/s
B. 200kb/s～10Mb/s
C. 10Mb/s～20Mb/s
D. 20Mb/s～36Mb/s
[单项选择]Why are many people still superstitious in modem society
A. Because there are still many things people cannot explain.
B. Because people know little about the birth and death of human beings.
C. Because people want to control the weather and many other situations.
D. Because superstitions can help them realize what they wish to do.
[单项选择]
Modem computers based onare（）millions to billions of times more capable than the early computers, which occupy a fraction of the space. Simple computers are small enough to fit into mobile devices, and mobile computers can be powered by small batteries. Personal computers in their various forms are icons of the Information Age and are what most people think of as ‘computers’.
A. central processing unit
B. integrated circuits
C. hard disk
D. software integration
[单选题] 和普通Modem不同,安装ADSL Modem时必须安装______协议。
A. TCP\IP
B. PPPoE
C. NetBEUI
D. RJ45
