题目内容
(请给出正确答案)
[单选题]
氧含量安全范围()
A.19.5%-21.5%
B.19.5%-23.5%
C.18.5%-20.5%
答案
B、19.5%-23.5%
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A.19.5%-21.5%
B.19.5%-23.5%
C.18.5%-20.5%
B、19.5%-23.5%
A.19.5%~23.5%
B.18%~20%
C.19%~21%
D.21%~23.5%
A.16.5%~19.5%
B.18.5%~21.5%
C.19.5%~25.5%
D.19.5%~23.5%
A.17.5%~19.5%
B.18.5%~20.5%
C.19.5%~23.5%
D.20.5%~23.5%
A.当可燃气体爆炸下限大于4%时,其被测浓度不大于0.2%为合格
B.爆炸下限小于4%时,其被测浓度不大于0.5%为合格
C.氧含量19.5%~23.5%为合格
D.H2S最高允许浓度不得大于10mg/m3