【单选题】【消耗次数：1】
在设备内检修、动火时含氧量应为19%~21%，燃烧爆炸物浓度低于安全值，有毒物浓度低于最高浓度值。（ ）
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正确
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错误
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【判断题】
带压不置换动火，就是严格控制含氧量，使可燃气体的浓度大大超过爆炸上限，然后让它以稳定的速度，从管道口向外喷出，并点燃燃烧，使其与周围空气形成一个燃烧系统，并保持稳定地连续燃烧。（ ）
①
正确
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错误
【单选题】
大部分消毒剂在高浓度时杀菌作用大，当浓度降低至一定程度时只有抑菌作用，但下列哪种消毒剂除外
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苯扎溴铵(新洁尔灭)
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苯酚(石炭酸)
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乙醇
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碘附
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