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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\">例说加速器的分类及原理</h4><div class=\"download_card_msg\">&ensp;&ensp;&ensp;&ensp;例说加速器的分类及原理 
&ensp;&ensp;&ensp;&ensp;加速器是利用电场对电荷进行加速的装置，主要部件包括三部分:①带电粒子源，发射电子、质子或离子等带电粒子;②产生加速电场。下面小编给大家分享例说加速器的分类及原理，希望能帮助到大家。 例说加速器的分类及原理文档下载网址链接：</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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