短語(yǔ)詞組短語(yǔ)underhand d stope 下向梯段工祖underhand single stope 下向單翼回采工作面Underhand drift stope and filling 下向進(jìn)路式充填法underhand stope bench [礦業(yè)]下向回采梯段 返回 underhand stope