培养学生的空間想象力是中学立体几何課程的目的之一,大家都知道,抽象的空間观念,必須通过具体实物的观察才能逐步地形成。但是在实践过程中却并非那样容易。初学立体几何的人就有这种感觉,开始难学,以后容易,这种困难表現在以下几个方面:(1)空間观念沒有建立,一遇到題 Cultivating students’ spatial imagination is one of the purposes of the three-dimensional geometry curriculum in middle schools. Everyone knows that the concept of abstract space must be gradually formed through the observation of concrete objects. However, it is not so easy in practice. Beginners who have a solid geometry feel this way, and they are difficult to learn and easy to learn later. This difficulty is manifested in the following aspects: (1) The concept of space is not established, and a problem is encountered