电化教育是现代化教育的组成部分,是优化课堂教学、提高课堂教学的有效途径之一。电教手段形式多样,作为其中之一的投影媒体,以其直观、形象、生动、感染力强等独特的长处和优势显现出极大的生命力,成为广大教师广泛采用的一种手段。 Electrification education is an integral part of modern education and is an effective way to optimize classroom teaching and improve classroom teaching. With various forms of audio-visual education, projection media, as one of them, has shown great vitality with its unique advantages and advantages of being intuitive, vivid and contagious, and has become a widely used method by teachers.