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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)纸的发明教学实录描述：《纸的发明》这是一篇科普知识短文，主要讲了纸的发展历程，揭开了只有蔡伦改进的造纸术传承下来的原因，并从中感受到造纸术对人类社会的巨大影响。下面是小编为大家整理的纸的发明教学实录5篇，希望大家能有所收获!纸的发明教学实录1学习目标 1.了解蔡</a>';
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