【单选题】【消耗次数：1】
机体处于氧债的标志是：
①
乳酸升高
②
氧流下降
③
血红蛋白下降
④
氧供增加
⑤
氧耗增加
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相关题目
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肺炎患儿鼻前庭导管给氧，氧流量和氧浓度的选择是（ ）
①
氧流量0.5-1L/min，氧浓度＜40%
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氧流量2-4L/min，氧浓度＜50%
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