【单选题】【消耗次数：1】
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%
②
氧流量2-4L/min，氧浓度＜50%
③
氧流量5-6L/min，氧浓度＜60%
④
氧流量7-8L/min，氧浓度＜70%
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