题目内容

Teaching objectives refer to what teachers hope to accomplish by the end of the lesson.

A. 对
B. 错

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Teachers should carefully plan the time for each activity.

A. 对
B. 错

New teachers are suggested to prepare some back-up activities.

A. 对
B. 错

对称三相Y接电路中，线电压超前与其相对应的相电压30°。

A. 对
B. 错

对称三相电路中，由于中线电流为零，所以各相电压电流也是独立的。

A. 对
B. 错