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var d = document.getElementById('downdoc');
d.innerHTML = d.innerHTML + '<a class=\"dow_btn\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(2)\"><em></em>下载文档</a>';

var d = document.getElementById('downdoc1');
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\">材料的强度</h4><div class=\"download_card_msg\">1　建筑材料的基本性质 
&ensp;&ensp;&ensp;&ensp; 
&ensp;&ensp;&ensp;&ensp;(1) 掌握材料的实际密度、表观密度、堆积密度、孔隙率、空隙率的概念以及计算公式、检测与评定方法。 
&ensp;。下面小编给大家分享材料的强度，希望能帮助到大家。 材料的强度文档下载网址链接：</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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