The method of NPV index is one of the methods that chooses the optimum plan of independent alternative for fund-limited enterprises.
净现值指数排序法是解决资金预算总额有限情况下独立型方案选优问题的方法之一。
From the results we know gross profit and NPV have obviously improved after optimization, so its reasonable for optimization grade index on this mine.
结果表明，优化后该矿的总利润和净现值有了明显的提高，说明将该矿的品位指标进行优化是合理的。
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