2009年的高考物理上海卷第9题是一道考查热学基础知识的选择题,它要求学生有较强的逻辑思维和推理能力,难度较大。虽答案明确,但出现的各种解答过程却有些不妥之处。文章指出了该题一些解法的不足之处,给出正确方法,并通过对题目稍加改动,避免了由于选择题本身特点以及题目设计不够完善而出现的答案的情况,更能考查出学生是否真正能够正确分析该问题,从而提高该题的区分度。 2009 college entrance examination Shanghai Volume 9 is a hot test of the basic knowledge of the multiple choice, which requires students to have strong logical thinking and reasoning ability, more difficult. Although the answer is clear, there are some pitfalls in the various solutions presented. The article points out the inadequacies of some solutions to the problem, gives the correct method, and through a slight change to the title, to avoid the characteristics of the multiple-choice questions and the design of the topic is not perfect enough to answer the question, but also test whether the students The real analysis of the problem can be correctly, so as to improve the degree of discrimination.