题目内容

三个频率相同、幅值相等的交流电源称为三相交流电源。

A. 对
B. 错

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____________(meaning)the person or thing that makes sth happen.

A. profession
B. dream
C. pollute
D. cause

____________(meaning)to give money,food,clothes,etc.to sb/sth,especially a charity

A. allow
B. remove
C. donate
D. help

____________(meaning)if a situation, an event or an activity related sb,they take part in it or are affected by it.

A. involve
B. recycling
C. invest
D. complicate

____________(meaning)belonging to or connected with the particular place or area that you are talking about or with the place where you live.

A. height
B. local
C. mountain
D. rubbish