治疗肾虚型胎动不安的代表方剂是：（）
A.寿胎丸
B.举元煎
C.保阴煎
D.苎根汤
E.加味圣愈汤
参考答案：A
— Your parents have never learned English, _____?
— Yes, they learned a little.
A．have they
B．haven’t they
C．didn’t they
D．don’t they
A．木块受浮力大
B．木块和蜡块受浮力相等
C．蜡块受浮力大
D．条件不足，无法比较
