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在自然教学中,合理利用普通投影仪进行实物投影,指导学生观察或演示某些实验,可以激发学生的兴趣,吸引学生的注意力,开拓学生的思维空间,提高观察、实验的可见度。在自然教学中,我利用普通投影仪做了以下几个实物投影:一、水蒸气凝结条件对比实验准备两个装温水的杯子、甲乙两块透明洁净的玻璃片。先将两块玻璃放在载物台上,通光后观察(它们的情状相同)。将甲放在酒精灯上加热后,把甲、乙分别盖在两个装温水的杯子上片刻,同时取下玻璃片,放回投影仪载物台(有水珠的一面朝上)。通
In nature teaching, making rational use of ordinary projectors to project in-kind projection and guiding students to observe or demonstrate certain experiments can stimulate students' interest, attract students' attention, open up students' thinking space and enhance the visibility of observation and experiment. In nature teaching, I use ordinary projectors to do the following several physical projection: First, compare the experimental conditions of water vapor condensation Preparation of two warm cups, A and B two pieces of transparent and clean glass. The first two pieces of glass on the stage, the light after the observation (their situation the same). Put the nail on the alcohol lamp and heat it. Then, place the nail A and the bottle B in two cups with warm water for a while, then remove the glass and put it back on the projector stage (the side with the water drop facing up). through