常见的人工气道有______和______等。
参考答案：气管插管 气管切开
---You should have prepared your speech for the meeting , Mr. Smith .
---Yes , I know . But how could I _______ the meeting date fixed so soon?
A．while
B．as
C．after
D．with
与“经济人”假设相应的管理方式是什么？
