金属矿山地下开采
Underground mining of metal mines
超量开采地下水
over-exploitation of underground water
地下采矿方法
underground mining methods
Underground mining method
地下采矿深孔爆破
long holeundergound blasting
地下金属管线检测仪
underground metal pipework detector
地下金属设施
underground metallic facility
地下矿山装备
Undergound mining equipment
非金属地下管线
nonmetal underground pipeline
非煤地下矿山
underground non-coal mine
non-coal underground mine
露天转地下采矿
open to underground mining