题目内容

Which song doesn't belong to the Beatles?

A. Without you
B. Let it be
C. Hey Judy
D. Five hundred miles

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Translate the following sentences.Don't ask what your country can do for you, but ask what you can do for your country！

1. He told me he would _ (再也不) go shopping with me.2. His father (过去常常) smoke, but now he doesn’t.

设一离散无记忆信源的输出由四种不同的符号组成，它们出现的概率分别为1/2、1/4、1/8、1/8，若信源每毫秒发出一个符号，那么此信源平均每秒输出的信息量为（）bit。

通信系统中常用的复用技术有时分复用、频分复用和。