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[单选题]
当暴露于硫化氢浓度超过()ppm,3到15分钟后将闻不到气味。此浓度下很快就会威胁到生命,并有可能对身体造成不可挽回的影响或后遗症,或者影响一个人的逃生能力?
A.100
B.15
C.5
D.2
查看答案
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A.100
B.15
C.5
D.2
A.立即安排专人观察风向、风速,以便确定受侵害的危险区;
B.切断危险区的不防爆电器的电源;
C.安排专人佩戴正压式空气呼吸器到危险区检查泄露点;
D.非作业人员撤入安全区。
A.15mg/m3(10ppm)
B.30mg/m3(20ppm)
C.150mg/m3(100ppm)
D.75mg/m3(50ppm)