题目内容
(请给出正确答案)
[单选题]
当环境空气中硫化氢浓度超过()时,应佩带正压式空气呼吸器。(按教材)
A.30ppm
B.15mg/m³(10ppm)
C.30mg/m³(20ppm)
D.150mg/m³(100ppm)
答案
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A.30ppm
B.15mg/m³(10ppm)
C.30mg/m³(20ppm)
D.150mg/m³(100ppm)