有三只电阻，阻值均为R，它们并联总电阻为（）。
A.3R
B.2R/3
C.R/3
D.R
参考答案：C
Do you know a concert _____ in our hometown next month?
A．will be held
B．is going to be held
C．is to be held
D．all A, B, C
治疗带下过多阴虚夹湿证，应首选的方剂是（）
A.五味消毒饮
B.内补丸
C.知柏地黄汤
D.止带方
E.龙胆泻肝汤
