题目内容

双绞线是由4根铜丝组成。

A. 对
B. 错

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双绞线的标准线序是568A和568B。

A. 对
B. 错

双绞线的接口是RJ45水晶头。

A. 对
B. 错

My train ______ at 8 o’clock tomorrow morning. Will you come to see me off?

A. leaves
B. will have left
C. is left
D. will be left

We congratulated him on ______ chairman.

A. his elected
B. his electing
C. his being elected
D. his is elected