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上向下向梯段联合回采法
meaning in Chinese
combined overhand and underhand stoping
Related Words
后退式回采
脚后跟向下
后心向下
向下凸出
向下式
向下弹射
掌心向下
向下负载
向下传
姿势向下
上向通风
上向通风砖窖
上向斜焊
上向因果性
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