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演示实验的成败关系重大，它将给学生留下深刻的印象。成功的演示，会给学生以令人信服的深刻印象，保证教学的顺利进行；失败的演示，即使是一次失败，也容易转移学生的注意力，引起学生许多不必要的疑虑，增加教学的阻力，影响教学效果。因此，对于每一个演示实验，教师都要?
The success or failure of the demonstration experiment is of great importance. It will leave a deep impression on the students. A successful demonstration will give students a convincing impression and ensure the smooth progress of teaching; failing to demonstrate, even if it fails, will easily distract the students and cause many unnecessary doubts and increase the resistance of teaching. Affect the teaching effect. So, for every demonstration experiment, teachers must?