------ I heard that as many as 100 people were killed in that coal mine accident?

------ Yes, ______ news came as ______ shock to us.

A．the ; /

B．the ; a

C．/; a

D．/; /

保证零部件互换性，允许加工的误差称为（）

A.配合

B.公差

C.形位公差

D.偏差