本文应用画法几何投影变换方法来研究瞬时螺旋运动有关构造、位移等参数之间的几何关系。
In this paper, the method of geometric transformation is used to search the relationship between the parameters of construction and the displacement of the flop.
在画法几何投影变换中，不论用换面法或旋转法，一般位置直线均需两次变换才能变成投影面垂直线。
In the transformation of descriptive geometry, no matter the method of change plane or revolve, the oblique line can be changed to a vertical line in two successive transformations.
本文从画法与解析两个方面，探讨了同素变换中的二重元素，并给出了其结论。
This paper mainly discusses the dual element in the same element transformation from the description and analysis, and gives the conclusion.
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