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发布时间:2024-07-27 01:01:50

[单项选择]

Modem mass-production methods lower the cost of making goods, and thus give us better values. At the same time, American ingenuity and science are constantly at work improving the quality of products. In this way, better quality products at good values are continually being brought to the people of all income groups.
As an example of how this works ,when facial tissues were first put on the market in 1924 ,they were made in limited quantities and sold at 65 cents per box of 200. People liked these facial tissues immediately and began asking for them when they went into different stores. Because there was such a demand for the product, manufacturers began making tissues in larger and larger quantities. Because the manufacturers were making tissues in greater quantities, their production costs were lowered, so that the cost of tissues went down.In the meanwhile, the quality of facial tissues was constantly improving, because more manufacturers went into the business of m
A. often go to clubs with their brothers and sisters
B. prefer lonely life to social life
C. live more happily than their parents and grandparents
D. like to share their feeling and thoughts with other people

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[单项选择]

Modem mass-production methods lower the cost of making goods, and thus give us better values. At the same time, American ingenuity and science are constantly at work improving the quality of products. In this way, better quality products at good values are continually being brought to the people of all income groups.
As an example of how this works ,when facial tissues were first put on the market in 1924 ,they were made in limited quantities and sold at 65 cents per box of 200. People liked these facial tissues immediately and began asking for them when they went into different stores. Because there was such a demand for the product, manufacturers began making tissues in larger and larger quantities. Because the manufacturers were making tissues in greater quantities, their production costs were lowered, so that the cost of tissues went down.In the meanwhile, the quality of facial tissues was constantly improving, because more manufacturers went into the business of m
A. fewer customers buy them
B. more and more of them are produced
C. their quality becomes poorer
D. more manufacturers produce them.

[单项选择]Modem的速率
A. 650M
B. 1024M
C. 56K
D. 1024字节
E. 1.44M
[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]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]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 (19)
A. 载波检测
B. 振铃指示
C. DTE就绪
D. DCE就绪

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