所谓正误对比教学法，就是在教学中，把正确与错误加以对比，突出特征，使学生明白有关实验对在哪里，错在哪里，错误的实验原因何在，如何改正。这样，能使学生加深对正确知识的领会，减少可能出现的错误。l通过对比，使学生重视仪器的使用方法要做好实验，必须先掌握仪器的正 The so-called right-to-error comparison teaching method is to compare the right and wrong in teaching, highlighting the characteristics, so that the students understand where the experiment is and where it is wrong, what are the causes of the wrong experiment, and how to correct it. In this way, students can deepen their understanding of correct knowledge and reduce possible errors. l By contrast, students must pay attention to the use of the instrument to do experiments, must first master the positive of the instrument