上期我们介绍了学习《工程制图》的方法和要点。本期就解题时应注意的几个问题作一简要介绍。点的投影习题,主要解决由空间到平面(根据点的空间位置作点的投影图),由平面到空间(根据点的投影,确定点的空间位置)的问题,概括起来就是空间(?)平面。这是学习《工程制图》和解题的基本思考方法。 In the previous period, we introduced the methods and main points of studying Engineering Drafting. This issue gives a brief introduction to several issues that should be noted when solving problems. The projective problem of the point mainly solves the problem of space-to-plane (projection of points based on the spatial position of the point), and the problem from plane to space (determining the spatial position of a point according to the projection of a point) is summarized as space (?) flat. This is a basic way of thinking about studying Engineering Drafting and solving problems.