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通信系统中，称调制前的电信号为，调制后的信号叫。

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分组交换的主要任务就是负责系统中分组数据的、、。

交换是网络实现数据传输的一种手段。实现数据交换的三种技术是、、。

信道复用技术主要有、、和码分多路复用四类。

Rewrite the following sentences after the models. ?xml:namespace>Model 1: the lawyer, less time, type letters, than the assistantIt takes the lawyer less time to type letters than it does the assistant.1. the manager, a whole afternoon, explain the new company regulations2. the government, several weeks, calm down the angry workers3. Jimmie, a whole day, figure out the complex situation