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提问人:网友macrohui
发布时间:2022-01-06
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![井下煤仓上方、地面选煤厂煤仓上方,甲烷传感器报警浓度、断电浓度、复电浓度分别是()。A.≥1.5%CH4,≥](https://img2.soutiyun.com/shangxueba/askcard/2023-10/4/1454/20231004110759515.jpg)
[主观题]
井下煤仓上方、地面选煤厂煤仓上方,甲烷传感器报警浓度、断电浓度、复电浓度分别是()。A.≥1.5%CH4,≥
井下煤仓上方、地面选煤厂煤仓上方,甲烷传感器报警浓度、断电浓度、复电浓度分别是()。
A.≥1.5%CH4,≥1.5%CH4,<1.5%ch4
B.≥0.5%CH4,≥0.5%CH4,<0.5%ch4
C.≥1.0%CH4,≥1.0%CH4,<1.0%ch4
D.≥1.5%CH4,≥2.0%CH4,<1.5%ch4
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