mine roof support for longwall advancing
长壁采矿法
longwall system【矿】;longwall workings【矿】
暂无补充释义。
相关词条
face support (longwall working), wandering
powered frame support for longwall advancing
face support (longwall working)
filling longwall method【矿】
longwall pillar working【矿】
mine roof suppo瞨t for longwall advancing
longwall-shortwall coal cutter