纵观2007年全国高考理综(陕西)卷中的物理试题,该部分的难度略高于2006年,但试题命题较好,全面体现了“稳中求进,注重基础”的命题思想,其中选择题对中等分数段考生的区分度较高.本文对第20题的解法作一探讨,可供大家参考.图1题目:a、b、c、d是匀强电场的4个点,它们正好是一个 Looking at the physical examination questions in the 2007 national college entrance examination science and technology (Shaanxi) volume, the difficulty of this part is slightly higher than that of 2006, but the propositions of the questions are good, fully embodying the proposition idea of ​​“striving for progress, focusing on the foundation”, among which Multiple-choice questions have a higher degree of distinction between candidates with medium-interval scores. This article discusses the solution to the 20th question for your reference. Figure 1 title: a, b, c, d are the 4 points of the uniform electric field, they It is exactly one