电教媒体以其独特的优势为优化课堂教学 ,提高教学质量开拓了新的天地。它通过化静为动、化虚为实、化远为近、化难为易、化抽象为具体、化宏观为微观等各种表现手法 ,充分地发掘学生的智力因素和非智力因素 ,使学生在参与教学活动的全过程中能更真实、更生动、更具体、更形象 Audio-visual media with its unique advantages for optimizing classroom teaching, improve teaching quality has opened up a new world. It is through the static and dynamic, the virtual reality, as far as possible, the difficult for the easy, abstraction as a concrete, macroscopic micro and other performance techniques to fully explore the students' intellectual and non-intellectual factors so that students In the whole process of teaching activities can be more real, more vivid, more specific and more image