An interval data envelopment analysis (DEA) model was first defined.

定义了区间数据包络分析(DEA)模型。

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There is an interval function that has been defined in Metric Space.

在度量空间中有一个定义好了的距离函数。

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There is an interval function that has been defined in Metric Space.

在度量空间中有一个定义好了的距离函数。

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