需要空气室的液泵有：（）。
A、离心泵
B、隔膜泵
C、滚子泵
D、活塞泵
参考答案：B, D
— What were you doing at 9:00 pm yesterday?
— ______ [ ]
A. I watched TV.
B. I was taking a bath.
C. I stayed with my friends.
左右寸关尺三部脉分候各脏腑，其中左关候哪个脏腑？（）
A.肝
B.心
C.脾
D.肺
E.肾
