... some preliminaries 预备知识 successive transformations 连续变换 functions 函数 ...
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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.
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。
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