发电机定子绕组短路的主保护是()保护。
A、负序电流
B、纵联差动
C、低压过流
D、横联差动
参考答案:B, D
_____ good, the apples were soon sold out. [ ]
A. Taste
B. Tasting
C. Tasted
D. Having tasted
Out teacher his hand on my shoulder and said, “Don’t leave your books about.”
A.laid, laying
B.lay, lain
C.laid, lying
D.lay ,laying