题目内容

A job

A. It may not require education or expertise.
B. It requires education and constant advances in job skills.
C. A person normally only does what is required to get the paycheck.
D. It is just the work a person does in exchange for money to make a living.
E. It refers to a lifelong process in which a person tries to achieve his professional goals.
F. A person would like to do more than what is required in order to progress, and is more concerned about job satisfaction than money.

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对称三相负载为星形联接,当相电压为220V时,线电压等于( )

A. 380V
B.220V
C. 127V
D. 无法确定

三相对称负载的功率,其中ψ是( )之间的相位角。

A. 线电压与线电流
B. 相电压与线电流
C. 线电压与相电流
D. 相电压与相电流

三相负载的连接可分为_____和______。

三相对称负载三角形连接时,线电压是相电压的____倍,线电流是相电流的___倍。

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