The ration of the element's content and the lowest industrial grade can be used to determine whether the deposit be formed by useful materials or not.
有用物质可否成为矿床，取决于某元素含量与最低工业品位的比值。
The ration of the element's content and the lowest industrial grade can be used to determine whether the deposit be formed by useful materials or not.
有用物质可否成为矿床，取决于某元素含量与最低工业品位的比值。
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