Jack _______ yet last night, otherwise he _______ me.

A．mustn’t have arrived; must have phoned

B．can’t have arrived; would have phoned

C．may have arrived; need have phoned

D．shouldn’t have arrived; can have phoned

（）时，镗床上应采用专用夹具进行工件装夹。

A.单件生产

B.成批量牛产

C.小批量生产

D.新产品试制