“cut-off grade of ore drawing”的概念、定义、翻译、参考文献-科学参考

单词	cut-off grade of ore drawing
释义	cut-off grade of ore drawing Encyclopedia 工学覆岩下放矿释 cut-off grade of ore drawing放矿截止品位在崩落法放矿过程中，最后一次放出矿石的品位。是一个重要的经济管理指标。
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