短语词组短语ore e grade 矿石品级ore removal grade 出窿品位ore -grade precipitate 矿石级沉淀物Unleachable ore -grade 难浸矿品位ore feed grade 入选品位ore operating grade 矿石作业品位ore slurry grade 矿浆品位iron ore slurry grade 铁矿浆品位mining ore grade 采矿等级 返回 ore grade