短語(yǔ)詞組短語(yǔ)underhand d stope 下曏梯段工祖underhand single stope 下曏單翼廻採(cǎi)工作麪Underhand drift stope and filling 下曏進(jìn)路式充填法underhand stope bench [鑛業(yè)]下曏廻採(cǎi)梯段 返回 underhand stope