题目
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. ≥1.5%CH4,≥1.5%CH4,＜1.5%CH4B. ≥1.0%CH4,≥1.5%CH4,＜1.0%CH4C. ≥0.5%CH4,≥1.0%CH4,＜0.5%CH4D. ≥1.5%CH4,≥2.0%CH4,＜1.5%CH4
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. ≥1.5%CH4,≥1.5%CH4,＜1.5%CH4
B. ≥1.0%CH4,≥1.5%CH4,＜1.0%CH4
C. ≥0.5%CH4,≥1.0%CH4,＜0.5%CH4
D. ≥1.5%CH4,≥2.0%CH4,＜1.5%CH4
题目解答
答案
B. ≥1.0%CH4,≥1.5%CH4,＜1.0%CH4