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可能偏差与误差面积是重力分选设备评定最常用的两个指标。本文依据特鲁姆普提出的分配曲线函数关系式，推导出可能偏差Ep与误差面积Ae的数学表达式，并用实验数据验证了公式的正确性。利用数学方法具有显著的优势，既不需要绘制分配曲线，也省去了计算误差面积所需的积分运算.
The possible deviations and error areas are the two most commonly used indicators for gravity sorting equipment. Based on the formula of distribution curve function proposed by Trump, this paper derives the mathematical expression of possible deviation Ep and error area Ae, and verifies the correctness of the formula with experimental data. The use of mathematical methods has significant advantages, neither need to draw the distribution curve, but also eliminates the need for calculation of the error area integral operation.