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mineral deposit drainage
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mineral deposit drainage
Encyclopedia
工学
矿山安全
释
mineral deposit drainage
矿床疏干
采用各种疏水构筑物及其附属排水系统,疏排地下水,以保障矿山安全生产的一种防治水技术措施。
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observatory
Observatory as a Mystical Graden
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observe life and experience life
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observing law of naturalness and cherishing truth
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