感应雷分为静电感应和电磁感应两种。
参考答案:对
Mr. Zhang is ill, so I'll _____ till he is well again.[ ]
A. take place
B. take his place
C. take the place for him
D. instead of
在短路电流计算中,平均电压与额定电压的关系是( )。
A.1倍; B.1.1倍; C.1.05倍; D.1.2倍。