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。
From the macroscopic point of view, the necessity of improving and optimizing the iron concentrate grade index, the potential technical ways and the thought on optimization study are described.
从宏观角度出发，阐述了提高和优化铁精矿品位指标的必要性、技术途径及优化研究的思路。
Combine the constructed index system with the selected evaluation method to establish the route optimization evaluation model of high-grade highway in the cold region.
将构建的评价指标体系和优选出的评价方法相结合建立了寒冷地区高等级公路路线方案优选模型。
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