浅析《机械制图》中直线段投影的教学

A Brief Analysis on Straight Line Segments Projection in “Mechanical Drawing” Teaching

文章用长方体作为辅助手段来分析、讲解空间直线段的投影,从三维入手,逐步转化到二维,得出直线段投影规律,便于学生理解。再由二维想象出三维空间结构,从而培养学生的空间思维能力和空间想象能力。

Using a cuboid as an auxiliary means,the paper analyzes and explains the projection of spatial line segmentsto realize the purpose of starting from the three-dimension,gradually changing into two-dimension and then concludingthe projection law of straight line segments,which is easier for students to understand.After that,based on two-dimension students can imagine three-dimensional structure.This in turn cultivates students＇ spatial thinking skills andspatial imaginative abilities.