1.目的要明确。在一定的课堂教学中,考虑要不要演示实验,选择什么样的演示实验,以及如何设计包括演示实验在内的教学过程都必须从教学目的出发。如在引入课题时运用演示实验,目的侧重在引导学生对所研究问题的兴趣,或唤起学生的思考,提出问题等,要求新奇、生动、有趣。如在形成概念和规律的教学法过程中运 1. Purpose should be clear. In certain classroom teaching, considering whether or not to demonstrate the experiment, what kind of demonstration experiment to choose, and how to design the teaching process including the demonstration experiment must proceed from the teaching purpose. If the demonstration experiment is used when the topic is introduced, the purpose is to guide the students’ interest in the research question, or to arouse the students’ thinking and raise questions, etc. The request is novel, vivid, and interesting. For example, in the process of forming concepts and laws