采煤工作面回风巷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,＜1.0%CH4 B.≥1.5%CH4,≥2.0%CH4,＜1.5%CH4 C.≥1.0%CH4,≥1.5%CH4,＜1.5%CH4 D.≥1.0%CH4,≥1.0%CH4,＜1.0%CH4正确答案D
采煤工作面回风巷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,＜1.0%CH4 B.≥1.5%CH4,≥2.0%CH4,＜1.5%CH4 C.≥1.0%CH4,≥1.5%CH4,＜1.5%CH4 D.≥1.0%CH4,≥1.0%CH4,＜1.0%CH4正确答案D
