演示实验既能提供必要的科学事实，使学生理解科学理论并深化记忆，还可使学生掌握实验技巧。为确保演示实验获得成功，提高实验效果，教师应从以下几方面努力。１目的明确，重点突出演示实验都有一定的教学目的，实验需要解决什么问题，突出观察什么现象，重点示范什么操... Demonstration experiments can provide the necessary scientific facts to enable students to understand scientific theories and deepen their memory, as well as enable students to master experimental techniques. In order to ensure the success of demonstration experiments and improve the effectiveness of experiments, teachers should work hard from the following aspects. 1 The purpose is clear, highlight the demonstration experiment has a certain teaching purpose, what problems need to be solved in the experiment, highlight what phenomenon to observe, and focus on what operation...