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问题 单项选择题 A1型题

正态近似法估计总体率的95%可信区间用（）

A.P±1.96s

B.P±1.96σ

C.P±2.58s

D.P±1.96sp

E.π±1.96σp

答案

参考答案：D

单项选择题

While assessing a 2-month-old child’s airway, the nurse finds that the child isn’t breathing. After two unsuccessful attempts to establish an airway, the nurse should（）

A. attempt rescue breaths.

B. attempt to reposition the airway a third time.

C. administer five back blows.

D. attempt to ventilate with a handheld resuscitation bag.
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单项选择题

没有"肠壁内积气"表现的是（）

A.小肠平滑肌瘤

B.缺血性结肠炎

C.坏死性小肠结肠炎

D.肠系膜上动脉栓塞

E.中毒性巨结肠
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