针对冶金企业内部的备件采购问题，在考虑总采购资金约束的情况下，优选采购备件的品种和数量，建立了备件采购模型，并且提出了生产效益因子的概念。

According to requirement of purchases plan and the capital constrain, it sets up the purchase model for optimal purchase quantity and variety, presents the idea of production benefit factor.

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