The old worker insisted that he ______ old, and ______ back to the working post again.

[       ]

A. wasn't; be sent

B. wasn't; was sent

C. be not; send

D. isn't; sent

压缩机房遇意外停电时，应采取的措施为( )。

A．先关闭吸气阀后关闭排气阀
B．同时关闭吸气阀和排气阀
C．先关闭排气阀(有止回阀并工作正常者不在此限)，然后再关闭吸气阀
D．关闭吸气阀，不关排气阀