试题详情

采煤工作面上隅角甲烷传感器报警浓度、断电浓度、复电浓度分别是( )、( )、( )

A≥1.0%CH4,≥1.5%CH4,

B≥1.5%CH4,≥1.5%CH4,

C≥0.5%CH4,≥1.0%CH4,

D≥1.5%CH4,≥2.0%CH4,