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本文用作图的方法直观地解答了2013年上海高考物理第20题,论证了颇有争议的C选项的正确性,同时分析了2012年3月的上海市第26届初中物理竞赛第35题的解答的错误所在。
The method used in this paper is a direct solution to the 20th issue of 2013 Shanghai Entrance Examination Physics, demonstrating the validity of the controversial C option and the 35th issue of the 26th Junior High School Physics Contest in Shanghai in March 2012 The answer to the error lies.