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                            <td><a class='down_stat doc_title' href="javascript:void(0);">&sect;19.1 .1平行四边形的定义、性质</a></td>
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                            <td><a class='down_stat doc_title' href="javascript:void(0);">(青岛版)2017年秋九年级上3.2《确定圆的条件》ppt课件(17页)</a></td>
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                            <td><a class='down_stat doc_title' href="javascript:void(0);">人教A版数学&middot;选修2-1第2章 圆锥曲线与方程-教学课件</a></td>
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                            <td><a class='down_stat doc_title' href="javascript:void(0);">(青岛版)2017年秋九年级上3.2《确定圆的条件》ppt课件(17页)</a></td>
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                            <td><a class='down_stat doc_title' href="javascript:void(0);">(鲁教版)数学九年级下册：5.2《圆的对称性》课件(2)</a></td>
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                            <td><a class='down_stat doc_title' href="javascript:void(0);">第四章 圆与方程</a></td>
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