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  <h2 style="font-size: 20px; margin: 20px auto; text-align: center;">关于</h2>
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              <h3 class="layui-timeline-title">系统架构</h3>
              <p>
                基于<em>PHP+MySQL</em>开发的考试管理系统，
                <br>前端框架使用的是<em>Layui 2.2</em>，后端框架使用的是<em>Yii 2.0</em>
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              <h3 class="layui-timeline-title">目标愿景</h3>
              <p>致力于推进教育行业的信息化、便捷化、绿色化</p>
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