二尖瓣狭窄常采取（） A．左侧卧位听诊 B．右侧卧位听诊 C．仰卧位听诊 D．前倾坐

下列属于堰塞湖的是（）。

A．长白山天池

B．镜泊湖

C．西湖

D．云南滇池

I’ve become good friends with several of the students ___helped me in the English speech contest last year.

A．who

B．where

C．when

D．which

拼花实木地板有哪些类型。

The shippers hope each mate’s receipt is to be signed right after（）.

A.the cargo is loading

B.the cargo is discharged

C.the cargo is on board

D.the cargo is damaged

检查输卵管通畅的首选方法是（）

A.输卵管通液

B.输卵管通气

C.宫腔镜

D.子宫输卵管造影

E.B超检查