The most important thing _______ we should pay attention to is the first thing ________ I have said.

A．which; that

B．that; which

C．that; that

D．which; which

新生儿常用通气模式有哪些

A．持续气道正压通气

B．间歇指令通气

C．同步间歇指令通气

D．辅助～控制通气

E．PEEP