一、重视演示实验的作用学生自己动手实验的优点的确很多,但它并不能完全取代演示实验。在有些实验器材紧缺的情况下,勉强分为七八个人一组,其实验效果也不能太好。有的实验操作技能要求较高,有必要教师给予演示指导,避免因学生的操作不规范,不正确,养成不良习惯。例如天平的使用中, First, the importance of demonstrating the role of experiment The do-it-yourself experiment has many advantages, but it does not completely replace the demonstration experiment. In some cases of shortage of experimental equipment, barely divided into seven or eight individuals, the experimental results can not be too good. Some experimental skills require a higher operation, it is necessary for teachers to give demonstrations and guidance, to avoid non-standard operation of students, not correct, develop bad habits. For example, the use of the balance,