—What does your mother do?

一_______.

 [ ]

A. She is nice.

B. She is cooking.

C. She is at home.

D. She is a bank clerk.

主动脉瓣关闭不全的病人的麻醉要点为（）

A.维持后负荷偏低

B.维持前负荷偏低

C.维持心率稍慢

D.维持心率稍快

E.维持前负荷正常或稍高