一、忌课前准备不充分演示实验作为一种教学手段,是教师备课的重要内容,需要教师认真研究和准备、有的教师轻视课前演示实验的准备工作,结果造成演示失败或出现意想不到的情况,以致在课堂上手忙脚乱,“强行”让学生接受结论,教学效果很不理想。造成这种情况的原因是多方面的,有的是思想认识存在问题,对实验教学不重视或持怀疑态度;有的是疏忽大意,认为实验内容简单,以前做过或曾经看见别人做过;还有的是怕麻烦。这些都是演示实验教学的大忌。为了改正这些毛病,教师在课前要从以下五个方面来做。1.要准备好与实验有关 First, avoid pre-class preparation is not fully demonstrated Experiment as a teaching tool is an important part of teacher preparation, teachers need careful study and preparation, and some teachers despise the preparatory work before the demonstration demo, resulting in demo failure or unexpected As a result, students are confused in the classroom and “forcibly” let the students accept the conclusion that the teaching effect is not satisfactory. There are many reasons for this situation. Some are ideological problems, neglectful or skeptical of experimental teaching. Some are negligent, think the experiment is simple, have done or have seen others before, and others have trouble . These are taboo to demonstrate experimental teaching. In order to correct these problems, teachers should do the following five aspects before class. 1. Be prepared to experiment with