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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With the method, we can transform the actual figure of each index or remark grade into the corresponding evaluation one.

通过该方法把各指标的实际值或评语等级转化为相应的评价分值。

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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。

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The Barclays Capital U.S. Aggregate Bond Index is an investment-grade domestic bond index.

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It makes sense for the investment-grade bond index to do better once its worst credit has dropped out.

ECONOMIST: Credit markets

That said, the Bank of American Merrill Lynch High-Grade Bond Master Index is up 3.75% through April 30 as a result of spread compression across the credit markets from the more lofty levels of the fourth quarter.

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