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The upward horizontal cut and fill stoping method and the measures for safe mining are recommended.
推荐使用机械化上向水平分层充填采矿法,提出了安全回采措施。
youdao
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The upward horizontal cut and fill stoping method and the measures for safe mining are recommended.
推荐使用机械化上向水平分层充填采矿法,提出了安全回采措施。
youdao