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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)化学必修二第二章知识点提纲描述：化学是在原子层次上研究物质的组成、结构、性质及变化规律的自然科学 ，这也是化学变化的核心基础。下面是小编整理的化学必修二第二章知识点提纲，仅供参考希望能够帮助到大家。化学必修二第二章知识点提纲化学能与电能1、化学能转化为电能的方式：电能(</a>';
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