短語(yǔ)詞組短語(yǔ)bench h mining 階梯式開(kāi)采composite -bench mining 組合臺(tái)階開(kāi)采open bench mining 露天臺(tái)階式開(kāi)采overhand bench mining method 上向梯段采礦法grouped bench mining 組合臺(tái)階開(kāi)采underground bench mining 井下梯段采礦法surface bench mining 露天臺(tái)階開(kāi)采high -bench mining 高臺(tái)階開(kāi)采high bench mining 高臺(tái)階開(kāi)采 返回 bench mining