【单选题】【消耗次数：1】
机械通气时，氧的吸入浓度一般从多少浓度开始
①
20-40%
②
40-60%
③
60-80%
④
80-100%
参考答案：
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TQ60/80型塔式起重机，其中的数字60/80表示：( )
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无法判断
【单选题】
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
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③
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④
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