longwall mining
短语词组
- longwall actual mining 走向长壁回采
- longwall advancing mining system 长壁采煤法
- longwall advancing mining stope 长壁式回采工作面
- longwall advancing mining workings 长壁开采法
- longwall shrinkage mining method 留矿全面法
- longwall advancing mining stoping 长壁采矿法
- longwall advancing mining slicing 长壁分层采矿
- longwall advancing mining retreating 长壁后退式回采
- longwall advancing mining mining 长壁式开采 返回 longwall mining