Without considering other aspects carbon nanotubes with the same aspect ratio have entirely uniform trend in charge density relative distribution curve.
在忽略其他条件影响下，长径比相同的碳纳米管，电荷密度相对分布曲线趋势完全相同。
Pointer Density: the number of items to render in the beam bezier curve.
(指针密度)：贝塞尔曲线光束渲染的物体个数。
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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