题目内容

在三相电路中，负载为星形连接时，必须连接中线。

A. 对
B. 错

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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

____________(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