演示实验一般由教师操作表演,对学生进行示范。为了提高实验效率,在教学中要注意以下几个问题。一、注重目的性演示实验是为教学服务的,因此,应根据教学的需要和学生的实际情况,注重实验的目的性,做到主题鲜明、目的明确。例如,学习“平抛运动”等内容时,目的是让学生 Demonstration experiment is usually performed by teachers performing demonstration of students. In order to improve the efficiency of the experiment, we should pay attention to the following questions in teaching. First, pay attention to the purpose of demonstration experiments for teaching services, therefore, should be based on the needs of teaching and students' actual situation, focus on the purpose of the experiment, so that the theme is clear, the purpose is clear. For example, learning to “ping-pong movement” and other content, the purpose is to allow students