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在高中物理教学中,功率是一个重要的知识点,在高考中也是常见的考点之一。其中非单调变化的瞬时功率问题的分析是重点、难点,由于定量分析计算需要较高的数学要求,故常见解析是利用特殊位置法、极限法进行定性分析,这在中学阶段不失为一种易于让学生掌握的方法,但仅仅此法显然不够严谨和丰满。为此,笔者想通过2008年江苏卷的一道高考题就此问题进行多角度探讨,愿与大家交
In high school physics teaching, power is an important point of knowledge, is also one of the common test centers in college entrance examination. Among them, the non-monotonous instantaneous power analysis is the key and difficult point. Because the quantitative analysis requires high mathematical requirements, the common analysis is to use the special location method and the limit method for qualitative analysis. Students master the method, but this method is obviously not rigorous enough and plump. To this end, I want to go through a college entrance examination in Jiangsu volume in 2008 to conduct multi-angle discussion on this issue, is willing to pay with everyone