§1.引言:在中学立体几何的教学上很好地使用模型,是有其重要意义的。这是因为学生在学过平面几何后,虽已具备了一定的认识和作出平面图形的能力,但是也正因为这样,使他们对于辨别图形的能力,局限于一张平面图纸上,而对于自己日常生存的客观空间中,千形万态的具体物体的几何形象的识别,尤其是在平面图纸上来理解空间图形,和空间图形的平面表示法等能力,在一定的程度上受到了窒碍,一般都表现得 §1. Introduction: It is of great importance to use the model well in the teaching of solid geometry in secondary schools. This is because students have acquired some knowledge of plane geometry and ability to make plane graphics after learning plane geometry, but also because of this, they are limited in their ability to discern graphics on a plane drawing, and for their daily routine In the objective space of existence, the recognition of the geometrical image of a thousand-shaped concrete object, especially the ability to understand the space graphics and the plane representation of the space graphics on plane drawings, is to a certain extent impeded, and generally Behave