患者男性,65岁,慢性肺心病,近几日因感冒而气急,咳嗽,痰不易咳出,口唇发绀,下肢水肿,情绪不稳,给患者吸氧,宜采用( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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