Local ventilation: Portable blow is adopted by the airless end or airless adit for ventilation.

局部通风：矿山生产期间对无贯穿风流的独头工作面或独头硐室采用局扇加强通风。

youdao

Local ventilation: Portable blow is adopted by the airless end or airless adit for ventilation.

局部通风：矿山生产期间对无贯穿风流的独头工作面或独头硐室采用局扇加强通风。

youdao