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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)八年级物理下册压强的知识点描述：物理学是关于大自然规律的知识;更广义地说，物理学探索分析大自然所发生的现象，以了解其规则。接下来小编在这里给大家分享一些关于八年级物理下册压强的知识点，供大家学习和参考，希望对大家有所帮助。八年级物理下册压强的知识点第一节力1、力的概念：力</a>';
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