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掏槽落煤法
meaning in English
holing
thirling
Related Words
掏刺
掏鼻孔
掏蚀
煤层掏槽
双掏槽
环形掏槽
上部掏槽
手工掏槽
锥形掏槽
平行掏槽
掏槽工
掏槽孔
掏槽炮眼
掏槽炮眼钻机
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