whiteboard vs dry erase board.In various textbooks, it is impossible for each text to have a vivid plot, some to introduce a common sense, and some to be philosophical. On the surface, such texts are ordinary and boring. For this kind of teaching materials and the reality of students' perception, the appropriate use of multimedia-assisted teaching will undoubtedly become a fuel for students to be curious about knowledge. For example, in the course of teaching "Bat and Radar", the teacher used dynamic courseware, combined with demonstrations and explanations, to reveal the principle of bat flying, and asked the students to demonstrate the "airplane night flight, chasing enemy aircraft" courseware. The students quickly understood that "the radar on the night flight is equivalent to the bat's mouth and ears. The radar transmits radio waves through the antenna, and encounters the obstacle of the enemy plane. The radio waves are reflected back and displayed on the screen. The aircraft receives the signal. You can react to the enemy planes playing it there is no return."