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投影手段用于课堂教学是电教内容的一部分，投影演示在课堂教学中的功能作用能否成功地运用，关键在于投影内容的构思与设计。下面，笔者结合近年来物理教学过程中设计投影演示的经验，谈谈投影演示设计所遵循的一些原则：1针对性、目的性原则要求投影内容的设计制作一定要针对
The projection method used for classroom teaching is part of the audiovisual content. The function of the projection presentation in classroom teaching can be used successfully. The key lies in the conception and design of the projection content. In the following, the author combines the experience of designing projection presentations in the physics teaching process in recent years and discusses some principles that the projection presentation design follows: 1) The targeted and objective principles require that the projection content be designed and produced.