石油外单位组团的双跨团组，团长是（）。 A.外单位人员 B.派出人员 C.外事处员工

槽钢型制动梁两闸瓦托中心距离超过（）时报废。

It's said that __________ is going to give us a lecture.

A．an American famous young

B．a famous American young

C．a famous young American

D．a young famous American

于前肢的肌肉是（）

A.髂肌

B.大圆肌

C.缝匠肌

D.内收肌

E.耻骨肌

I don't know _____ to do with it. Will you please show me how? [ ]

A. where

B. when

C. how

D. what

免疫防御(immunologic defence)