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本文根据可选性曲线间的内在联系，提出一个数学模型的构造方法，以此法构造的模型能防治可选曲线形状失真，并能绘出密度曲线的尾部和浮煤累计硫分曲线。
In this paper, according to the inherent relationship between the selectable curves, a mathematical model is proposed. The model constructed by this method can prevent the distortion of the optional curve and plot the tail of the density curve and the cumulative sulfur profile of the floating coal.