The continuous ion exchange process was analysed through the concept of probability density and conversion distribution function.
引用概率密度的概念，即转化率分布密度函数对连续离子交换过程进行分析。
When a inverse function of monotone function can not show the explicit formula, the distribution density curve of continuous randon variable can be gained with a parametric equation.
当单调函数的反函数不能显性表示时，连续型随机变量的分布密度曲线仍可通过参数方程的形式获得。
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