This paper put forward a new method to carry out dynamic appraisal of the extent of resources utilization in each stage of gold mine production by using differential grade index.

文中提出了应用级差品位指标动态评价岩金矿山生产各阶段资源利用程度的新方法。

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It is clear and definite that the speed grade of the differential dual drive sy-stem is good enough to meet the demands for free tension continuous rolling.

从理论与实践上，明确了差动调速系统的速度品质是好的，满足了自由张力小型连轧工艺的要求。

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The concept of the differential and cut-off grade is pointed out, and its mathematical model is built as well.

提出了级差边际品位的概念，建立了级差边际品位的数学模型。

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