在概率的一系列计算问题中，需要准确认识积分中变量的意义和利用图示作为辅助工具。
In a series of problem in probability calculation need for understanding the signification of integral variable and using graphical representation as an assistant tool.
通过直接积分得到了有限长密绕矩形螺线管自感系数的精确表达式，并对结果进行了图示和讨论。
The exact expression is obtained by integration method for a tightly wound rectangular solenoid of finite length, the result is plotted and discussed.
通过直接积分得到了有限长密绕矩形螺线管自感系数的精确表达式，并对结果进行了图示和讨论。
The exact expression is obtained by integration method for a tightly wound rectangular solenoid of finite length, the result is plotted and discussed.
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