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[单选题]
固定式和便携式硫化氢监测仪的第一级报警值应设置在(),达到此浓度时启动报警,提示现场作业人员硫化氢的浓度超过阈限值
A.15mg/m3(10ppm)
B.30mg/m3(20ppm)
C.150mg/m3(102ppm)
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A、15mg/m3(10ppm)
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.15mg/m3(10ppm)
B.30mg/m3(20ppm)
C.150mg/m3(102ppm)
A、15mg/m3(10ppm)
A.10mg/m3和30mg/m3
B.15mg/m3和30mg/m3
C.6.67ppm和20ppm
D.10ppm和20ppm