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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)九年级下化学第八单元知识点描述：化学是一门以实验为基础的自然科学。门捷列夫提出的化学元素周期表大大促进了化学的发展。如今很多人称化学为“中心科学”。下面是小编整理的，仅供参考希望能够帮助到大家。下面是小编整理的九年级下化学第八单元知识点，仅供参考希望能够帮助到大家。九年级</a>';
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