-- Have you each got a computer in your office?

-- Of course.        of our work           by the computer.

A．Two thirds, are done

B．Two third, were done

C．Three quarters, is done

D．Three fourth, was done

汽相热媒系统压力低于（）时，不能对汽相热媒系统进行排汽操作。

A、0.05MPa（表压）

B、0.08MPa（表压）

C、0.08MPa（绝压）

D、0.15MPa（绝压）