看图方法研究--类似形互补原理

提出了一种利用类似形互补原理，判断两个不同投影面的垂直面是否相交以及它们的交线部分的看图新方法，目的在于解决视图中的斜线问题，便于理解和把握形体的整体形状，便于看图和画图。尤其是当形体比较复杂，甚至经多次切割时，更能体现出此方法的妙用。

The research on analyzing drawing--principle of complementary similar shape

This article presents the reader a new method of judging if the vertical planes of two different projecting planes are crossing and how to analyze the intersecting lines of it by using the similar shape complementary principle. The arm of this principle is to solve the problem of the oblique line in the drawing so to understand and gain a more complete idea of the whole drawing and to help to read and draw it, especially when confronted with a more complex drawing even one that has been cut out for many times.