A：Oh... um... do you mind if I smoke
B：().
A：Oh, I didn’t notice.
B：Mum. There’s a sign on the door.

A. How long for

B. Well, yes, actually, this is a no smoking compartment.

C. I don’t think I agree with you.

D. When exactly

加弹机因网络压空波动而报警时，操作人员须完成哪些工作？