开始时间 : 2019-05-13结束时间 : 2019-08-07
步骤描述：
<p class="hdjg_title clear" style="margin-top: 0px; margin-bottom: 0px; padding: 0px 0px 0px 10px; border: 0px; line-height: 26px; word-break: break-all; zoom: 1; color: rgb(73, 73, 73); font-size: 16px; background-image: url("../images/bd.jpg"); background-position: left 10px; background-size: initial; background-repeat: no-repeat; background-attachment: initial; background-origin: initial; background-clip: initial; font-family: 微软雅黑; white-space: normal;"><span style="margin: 0px; padding: 0px; border: 0px; word-break: break-word; float: right; font-size: 14px; color: rgb(153, 153, 153);"><span class="yjs" style="color: rgb(255, 255, 255); background-image: url("../images/hd_bg2.png"); background-position: left center; background-size: initial; background-repeat: no-repeat; background-attachment: initial; background-origin: initial; background-clip: initial; display: inline-block; width: 65px; height: 26px; padding-left: 15px; text-align: center; line-height: 26px; position: relative; left: 10px;">未发布</span></span></p><p class="hdjg_bt" style="margin-top: 0px; margin-bottom: 0px; padding: 0px; border: 0px; line-height: 28px; word-break: break-all; color: rgb(102, 102, 102); font-family: 微软雅黑; white-space: normal;"><span style="margin: 0px; padding: 0px; border: 0px; word-break: break-word;">图形与变换在数学教学中的作用，如 ：认识和欣赏图形，理解图形的性质等</span></p><p><br/></p>
