优质锰矿
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high quality manganese ore 优质锰矿
the high-quality manganese ore 优质锰矿
high quality manganese ore deposit 优质锰矿
high quality manganese ore deposits 优质锰矿
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Some high quality manganese ore deposits of China are found to be polygenetic compound ore deposits which are the products of diwa mineralization.
研究发现中国某些优质锰矿，属复成矿床，它们都是地洼成矿作用的产物。
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