一、鼓励学生操作演示实验演示实验通常是由教师按部就班地表演和示范给学生的实验。但在教学中笔者发现 ,每每遇到演示实验 ,学生们总是很感兴趣 ,大家都站起来看。有时效果不佳时 ,一些学生甚至跃跃欲试 ,恨不得自己上去做。据此 ,我因势利导 ,对演示实验作了如下的改进 :一 I. Encourage students to operate demonstration experiments Demonstration experiments are usually performed by teachers in a step-by-step manner to demonstrate and demonstrate to students. However, in the teaching, the author discovered that students often are interested in the demonstration experiment. Everyone stands up and looks at it. Sometimes when the effect is not good, some students even eager to try and wait for themselves to do it. Based on this, I made the following improvements to the demonstration experiment: