单选题
矿井安全监控系统甲烷传感器应垂直悬挂,距顶板(顶梁、屋顶)不得大于(),距巷道侧壁(墙壁)不得小于()。
A300mm,300mm
B200mm,200mm
C200mm,300mm
D300mm,200mm
正确答案
答案解析
略
A300mm,300mm
B200mm,200mm
C200mm,300mm
D300mm,200mm