An effective method was brought forward to realize interactive selection of arbitrary point on parametric curved surface.
提出了一种实现参数曲面上任意点选取的有效方法。
Thus, we give a make-graph method of conic section on plane with arbitrary point as foci, arbitrary line as directrices and arbitrary positive number as eccentricity.
从而给出了以平面上任意点为焦点、任意直线为准线，任意正数为离心率的圆锥曲线的直接作图方法。
This article gives a description of a method to ascertain the magnetic field at any arbitrary point of magnetic dipole space by a kind of reciprocity principle.
本文用互易定理，给出一种确定磁偶极子空间任意点的磁场的方法。
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