The article mainly sue method of analysis history data and comparison.

文章主要采用史料分析的方法、比较的方法.

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The output forecasting influenced by uncertain history - data of film evaporators is studied by Rough Set theory.

应用粗糙集理论研究了薄膜蒸发器历史数据不确定影响下的产量预测问题.

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HEM is built up with projects history data by statistic regression analysis and the least squares.

用统计回归分析、最小二乘法拟合,建立了HEM数学模型.

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