利用长方体直观理解平面及其投影特性

摘要

The Plane and its projection is abstract and difficult to understand for students. The concepts and projection feature of the oblique plane, the projections’ perpendicular plane and the projections’ parallel plane to projection planes become clear by putting these planes in contact with a box.%在学习平面投影时，学生感到抽象而难以理解。通过平面与长方体的联系，投影面平行面、投影面垂直面和一般位置平面等的概念和性质一目了然。