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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(1)\"><em></em>下载文档(未登录)物理必修一牛顿定律知识点描述：学好物理的方法之一就是重视知识点之间的串联，比起其他学科，物理各个知识间的联系性更强，考试卷子试题非常综合，即在同一道题中会考察到多个考点。下面是小编整理的物理必修一牛顿定律知识点，仅供参考希望能够帮助到大家。物理必修一牛顿定律知识点1、动</a>';
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