患者,男性,50岁,慢性鼻窦炎。鼻部手术后以口呼吸,患者主诉心前区不适,拟采用面罩吸氧,其氧流量应该为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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