![](https://lstatic.shangxueba.com/jiandati/pc/images/pc_jdt_tittleico.png)
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.≥0.5%CH ,≥0.5%CH ,<0.5%CH
B.≥1.5%CH ,≥1.5%CH ,<1.5%CH
C.≥1.0%CH ,≥1.0%CH ,<1.0%CH
D.≥1.5%CH ,≥2.0%CH ,<1.5%CH
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_q_ckda.png)
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_panel_vip.png)
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_q_wyda.png)
- · 有5位网友选择 C,占比26.32%
- · 有4位网友选择 A,占比21.05%
- · 有3位网友选择 C,占比15.79%
- · 有3位网友选择 B,占比15.79%
- · 有3位网友选择 A,占比15.79%
- · 有1位网友选择 B,占比5.26%