According to the value of weighted mean roughness the priority of different characteristic information can be distinguished, so the proposed method possesses strong tolerant ability.

按加权平均粗糙集的大小区分层内各特征信息的优先级，具有很强的容错能力。

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This paper gives the new method to prove the cauchy mean value theorem which also may be deduced from the Lagrange mean value theorem.

给出柯西中值定理的一个新的证法，说明柯西中值定理也可由拉格朗日中值定理导出。

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This method has the dynamic characteristic and so different from the traditional method to take the mean value.

它具有综合和动态的特色，从而有别于分级取平均指标的传统分类方法。

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