题目内容

()正弦电路中,有效值要大写:U、I

A. 对
B. 错

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()正弦电路中,瞬时值要小写:u、i。

A. 对
B. 错

Tom exchanged his penJohn’s toy.

A. to
B. for
C. in

He wants to play table tennis but can’t find a _________ (搭档).

A. classmate
B. partner
C. person

Driving on the mountain road makes him___________(紧张的\害怕的).

A. nervous
B. worried
C. upset

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