临床上哪些患者应慎用或禁用潘库溴铵（）
A.主动脉瓣狭窄
B.二尖瓣脱垂
C.二尖瓣狭窄
D.主动脉瓣回流
E.二尖瓣关闭不全
参考答案：A, B, C
坐板凳是指在网上论坛中第一个回帖。
We _____ each other since you left. [ ]
A. didn't see
B. hadn't
C. haven't seen
D. have seen
