并应用这些技术和方案成功处理了磁二矿易燃煤层综放开采自燃危险区及火区。

These techniques and schemes are employed successfully to extinguish or prevent fire zones in Ciyaobao coalmine.

youdao

并应用这些技术和方案成功处理了磁二矿易燃煤层综放开采自燃危险区及火区。

These techniques and schemes are employed successfully to extinguish or prevent fire zones in Ciyaobao coalmine.

youdao