独活的功效是（）
A.止痛，利水
B.补肝肾，强筋骨，安胎
C.止痛，解表
D.通经络
E.通络止痛，退虚热，清湿热
参考答案：C
________ is mentioned above that the number of the students in senior high school is increasing.
A．Which
B．It
C．That
D．As
开关型稳压电源的功率因数为（）。
A.0.5
B.0.7
C.0.85
D.0.9以上
