3MW及以下发电机过电流保护采用（）。
A.一般过电流保护
B.复合电压启动过电流保护
C.低电压启动过电流保护
参考答案：C
The manager had fallen asleep where he_____, without undressing. [ ]
A. was laying
B. was lying
C. had laid
D. had lied
A．摩擦起电是创造了电
B．摩擦过玻璃棒的丝绸上带的电是正电荷
C．带负电的橡胶棒能吸引小纸屑，则纸屑一定带正电
D．将带正电的玻璃捧与带负电的橡胶棒接触，电子由橡胶棒转移到玻璃捧
