The canopy of an inflatable liferaft should().
A. go into place as the raft is inflated
B. be put up after everyone is aboard
C. be put up only in severe weather
D. be used as a sail if the wind is blowing
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由大肠杆菌引起的感染是:()
A. 一般的化脓菌感染
B. 特异性感染
C. 原发性感染
D. 伤口邻近的感染
E. 远离伤口的感染
鼻咽通气道使用的禁忌证是()。
A. 鼻息肉
B. 咽炎
C. 颌间固定
D. 鼻窦炎
E. 上呼吸道梗阻