晶闸管变流装置的功率因数比较()。
A.高,
B.低,
C.好。
参考答案:B
—What do you think of Betty?
—Compared_______ many other students she is more careful.[ ]
A. to
B. for
C. like
D. with
简述轻载下,调整感应型电度表的方法及调整中应注意的问题。