His silence at the meeting suggested that he _______ to your plan.

A．hadn’t agreed

B．didn’t agree

C．wouldn’t agree

D．not agree

按照压缩气体种类和用途的不同分类，( )不属于螺杆式压缩机。

A．喷油压缩机
B．工艺压缩机
C．制冷压缩机
D．空气压缩机