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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(2)\"><div class=\"download_card\"><div class=\"card_nr card_nr_lb\"><h4 class=\"card_bt\">八年级下册物理浮力的知识点总结</h4><div class=\"download_card_msg\">浸在流体内的物体受到流体竖直向上托起的作用力叫作浮力。浮力指物体在流体(液体和气体)中，各表面受流体压力的差(合力)。下面小编给大家分享一些八年级下册物理浮力的知识点，希望能够帮助大家!八年级下册物理浮力的知。下面小编给大家分享八年级下册物理浮力的知识点总结，希望能帮助到大家。 八年级下册物理浮力的知识点总结文档下载网址链接：</div></div><div class=\"download_card_btn download_card_btn_lb\"><div class=\"content_box_tj\"><span>推荐度：</span><img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\"></div><div class=\"downlod_btn_right demo_tc downlod_btn_right_lb\"><em class=\"downlod_icon\"></em>点击下载文档<span>文档为doc格式</span></div> </div></div></a>';
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