Gradation of classifying tailings was researched with fractal theory.

采用分形理论研究分级尾砂的级配。

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With fractal theory, a new fractal dimensional calculation is adopted to calculate two dimensional fractal dimension of EDM surface.

利用分形理论，采用一种新的分形维数计算方法，得出电火花加工表面的二维分形维数。

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Study result expressed that the stocks in the same kind have extremely strong similarity in movement after they are clustered with fractal theory.

研究结果表明，以分形理论为基础对股票进行聚类，同一类股票具有极强的相似走势。

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