串联电抗器电抗值允许偏差()。
A.正负2%
B.正负4%
C.正负5%
D.0~10%
参考答案:D
治疗月经过少血虚证的首选方剂是()
A.归肾丸
B.滋血汤
C.六味地黄丸
D.保阴煎
E.右归丸
The girl devoted all her time she had_______ others.
A.to help
B.helping
C.to helping
D.helped