患儿女,5个月,T37.9℃,呛奶,咳嗽,有痰,咳不出,出现面色发绀,呼吸急促,双肺可闻及散在的干、湿啰音,护士应首先采取的措施是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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