选择题是物理中考的必考题型,主要考查同学们对基础知识的掌握情况.解答这类题目,不应只满足于答案正确,而应注重解题方法的选择,争取用一种最快、最好的方法来解题.下面以几个典型题为例,谈谈物理选择题的快速解法.一、排除法例1如图1所示,电源电压不变,当滑动变阻器的滑片P位 The multiple-choice questions are the exam questions for physics examinations. They mainly examine the mastery of basic knowledge of the students. To answer such questions, you should not only be satisfied with the correct answers, but should focus on the choice of method of solving problems and strive to use the fastest one. The best way to solve the problem is as follows. Take a few typical questions as an example to talk about the quick solution to the physical multiple choice question. I. Exclude Rule 1 As shown in Figure 1, the power supply voltage does not change when sliding the P-position of the varistor P