在电教课上,老师常会自己动手制作幻灯片,方法大都是在玻璃片或透明塑料片上用透明的水彩色绘制而成。但由于手、笔等条件的限制,绘制的幻灯片图案较为简单。在没有条件专业制作幻灯片的情况下,利用照相法来制作幻灯片,方法简单,价格便宜,一般摄影爱好者都可以自己动手制作,具? In the electronic lesson, teachers often do their own slides, the method is mostly in glass or transparent plastic sheet with a transparent water color drawn. However, due to the hand, pen and other conditions, the drawing of the slide pattern is relatively simple. In the absence of conditions professional production of slides, the use of photographic methods to produce slides, the method is simple, cheap, the general photography enthusiasts can DIY, with?