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问题 单项选择题

光纤通信中使用的复用方式是 (13) 。E1载波把32个信道按 (14) 方式复用在一条 2.048Mb/s的高速信道上，每条话音信道的数据速率是 (15) 。

14（）

A．时分多路

B．空分多路

C．波分多路

D．频分多路

答案

参考答案：D

填空题

Windows 98系统的虚拟机管理程序由一系列的 【13】 组成，他们包含在Vmm32.vxd中。
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单项选择题

Electronic mail, or mail, as it is known to its many fans, has been around for over two decades. Typically, email systems support five basic functions, as described below. (41) refers to the process of creating messages and answers. (42) refers to moving messages from the originator to the recipient. (43) has to do with telling the originator what happened to the message. Was it rejected Was it lost (44) incoming message is needed. So people can read their email. (45) is the final step and concerns what the recipient does with the message after receiving it.

（42）是（）

A.Composition

B.Transfer

C.Reporting

D.Displaying
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