【单选题】【消耗次数：1】
HFNC应用生理效应正确的是
①
正气压，提高呼气末容积
②
恒定氧浓度
③
气道黏膜保护及提高黏膜纤毛清除能力
④
降低鼻咽腔解剖无效腔量
⑤
以上均是
参考答案：
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相关题目
【单选题】
鼻咽导管吸氧的氧浓度的计算方法是（）
①
鼻咽导管吸氧的氧浓度=4+氧流量
②
鼻咽导管吸氧的氧浓度+21+氧流量
③
鼻咽导管吸氧的氧浓度（％）=21+4×氧流量（L／min）
④
鼻咽导管吸氧的氧浓度+氧流量（L／min）
⑤
鼻咽导管吸氧的氧浓度+21+氧流量
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