保持呼吸道通畅的护理措施不包括
A．翻身叩背，协助排痰
B．定时吸痰
C．超声雾化吸人
D．加强给氧
E．增加进食
参考答案：D
As a new graduate, he doesn't know______ it takes to start a business here. [ ]
A. how
B. what
C. when
D. which
简述组织实施外部沟通的对象
