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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)九年级上化学燃烧及其利用知识点描述：燃烧是一种放热发光的化学反应，其反应过程极其复杂，游离基的链锁反应是燃烧反应的实质，光和热是燃烧过程中发生的现象。下面是小编整理的九年级上化学燃烧及其利用知识点，仅供参考希望能够帮助到大家。九年级上化学燃烧及其利用知识点一、燃烧和灭火1、燃</a>';
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