煤与瓦斯突出矿井采煤工作面进风巷,甲烷传感器报警浓度、断电浓度、复电浓度分别是()。
A.≥0.5%CH4,≥0.5%CH4,＜0.5%CH4 B.≥1.5%CH4,≥1.5%CH4,＜1.5%CH4 C.≥1.0%CH4,≥1.5%CH4,＜1.0%CH4 D.≥2.0%CH4,≥2.5%CH4,＜2.0%CH4正确答案A
煤与瓦斯突出矿井采煤工作面进风巷,甲烷传感器报警浓度、断电浓度、复电浓度分别是()。
A.≥0.5%CH4,≥0.5%CH4,＜0.5%CH4 B.≥1.5%CH4,≥1.5%CH4,＜1.5%CH4 C.≥1.0%CH4,≥1.5%CH4,＜1.0%CH4 D.≥2.0%CH4,≥2.5%CH4,＜2.0%CH4正确答案A
