The damaged building           , so the people will have to look for other places to shelter themselves from the cold.

A．is being repaired

B．is repaired

C．has been repaired

D．was repaired

数控机床上所用的夹具主要有两类，一类用于轴类零件的夹紧，另一尖用于（）零件的夹紧。

A.盘类

B.组合类

C.箱体类

D.板类