This paper evolves the measure of the system parameter corresponding to the bifurcation point (set) in parameter space and sets up the mathematical expression formula of the potential of accident.
在参量空间，论文以分岔点(集)为参照导出对系统参量的度量，建立事故潜势的数学表达式。
To study the intersection visibility of two general place planes, this paper set the planes as two faces of front and backs from the point of projection character of a space plane.
为了研究两平面相交可见性的规律，从空间一个平面的投影特点入手，将平面分别设定为正面、背面两面，讨论平面图形各顶点投影顺序与平面正面、背面的投影所具有的内在规律。
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