在化学教学中，精讲多练是一个成功的化学教师所必须具有的素质。“讲”有方法、有艺术，而“练”有选择、有目的，更有技巧。“练”有三个目的：一是对学过的知识内容进行检验；二是完善、巩固新知识，使之及时消化、吸收；三是在检验吸收的同时促进智力发展、形成能力。... In chemistry teaching, exquisite speaking and practicing are the qualities that a successful chemistry teacher must possess. “Speaking” has methods and art, and “training” is selective, purposeful, and skillful. “Practice” has three purposes: one is to test the knowledge content that has been learned; the other is to improve and consolidate new knowledge so that it can be digested and absorbed in a timely manner; third is to promote intellectual development and form capabilities while testing absorption. ...