题目内容

对称三相电路是指__。

A. 电源对称的电路
B. 负载对称的电路
C. 电源和负载均对称的电路
D. 电源和负载及端线阻抗均对称的电路

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负载△连接时,线电流等于相电流。( )

A. 对
B. 错

三相电压的相序一般分为__。

A. 正序
B. 同序
C. 负序
D. 反序

The college students in China are _______ from smoking on campus because this will do them no good.

A. discouraged
B. observed
C. obeyed
D. obtained

Exercise: Fill in the blanks with the correct forms in the bracket.He often ________(have) dinner at home.