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恰当地运用直观教具,对加强教學直观性、培养学生空問想象力从而提高教学貭量有重要作用。我发現,有时由于对演示教具注意不够,也会影响教学效果。有一次,听某教师的課,他在演示圓柱面这一教具的过程中(图1),当說到用垂直子母綫的平面截圓柱面得到是圓时,本应将模型轉90°,使学生获得图2的形象,由于教具角度摆的不好,多数学生却获得了模型側面正投影的形象(图3)。显然,这是沒充分发揮教具的应有作用。
Appropriate use of visual aids plays an important role in enhancing the intuitiveness of teaching, cultivating students’ space imagination and improving teaching quality. I found that sometimes due to insufficient attention to demonstration teaching aids, it will also affect teaching effectiveness. On one occasion, listening to a teacher’s class, he demonstrated the cylindrical surface of the teaching aid (Fig. 1). When it was said that the plane-cut cylindrical surface of the vertical sub-bus was a circle, the model should be turned 90°. The students were given the image of Figure 2, and due to the poor teaching aids, most students obtained the image of the orthographic projection of the model (Figure 3). Obviously, this is due to the inadequate use of teaching aids.