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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\">苯环上取代反应的定位规律</h4><div class=\"download_card_msg\">&ensp;&ensp;&ensp;&ensp;1.定位规律 
&ensp;&ensp;&ensp;&ensp;当苯环上有了一个取代基A，再发生亲电取代引入第二个取代基E，理论上取代基E可以进入的位置可以有三种，即进入取代基A的邻位、间位和。下面小编给大家分享苯环上取代反应的定位规律，希望能帮助到大家。 苯环上取代反应的定位规律文档下载网址链接：</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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