A simple and convenient method of drawing indicates oblique plane, direction of projection, is given in this paper, making it more simple and direct as well as speedy to chart.
给出了双斜平面的一种简便的图示方法——“斜投影法”，使作图更加简捷、迅速。
The projection of the special points on the intersection line of cylinder with oblique cylinder , of cone with half sphere and of oblique cylinder with cone are determined with the analytic method.
本文用解析法确定圆柱与斜圆柱、圆锥与半球及斜圆柱与圆锥的交线上特殊点的投影。
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