钻眼过程中，更换钻杆时，要先（），后（）。
A、关风；关水
B、关水；关风
C、关机；关水
D、关机；关风
参考答案：A
It was _____ she took off her dark glasses _____ she was a famous film star. [ ]
A. when, that didn't realize
B. not until, that I realized
C. not when, when I realized
D. until, that I didn't realize
米力农属于（）
A.血管扩张药
B.血管紧张素Ⅱ受体拮抗药
C.磷酸二酯酶抑制药
D.强心苷类正性肌力药
E.血管紧张素Ⅰ转化酶抑制药
