- May I open the window for a while? It's a bit warm inside.

-________.[ ]

A) Yes, I'd like to.

B) Not at all.

C) Don't mention it.

D) Yes. go ahead.

由于介质不同，密封可以分为（）等。

A、大气密封

B、干燥空气密封

C、充氮密封

D、去氧密封