单项选择题

以撒貌美的妻子叫什么？

A．撒拉
B．利百加
C．路德
D．乌利亚

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多项选择题

有机磷酸酯类中毒的用药原则是（）。 A. 联合用药 B. 早期用药 C. 足量用药 D. 重复用药 E. 大剂量用药

单项选择题

The reason why the no-load current of the primary winding is very small when the transformer is in no-load operation is ().
A、The number of turns of the original winding is large, and the resistance is large.
B、Leakage reactance of primary winding is very large;
C、Transformer excitation impedance is very high.