题目内容
(请给出正确答案)
[单选题]
当空气中硫化氢浓度超过30mg/m3(20ppm)时,应使用正压式空气呼吸器,正压式空气呼吸器的有效供气时间应大于()min。
A.10
B.20
C.30
D.40
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A.10
B.20
C.30
D.40
A.30ppm
B.15mg/m³(10ppm)
C.30mg/m³(20ppm)
D.150mg/m³(100ppm)
A.15mg/m3(10ppm)
B.30mg/m3(20ppm)
C.150mg/m3(100ppm)
D.1500mg/m3(1000ppm)
A.15mg/m3(10ppm)
B.30mg/m3(20ppm)
C.150mg/m3(100ppm)
A.迅速打开排风扇
B.疏散下风向人员
C.戴上防护用具、进入紧急状态
D.立即实施应急方案
A.绿牌
B.黄牌
C.红牌