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老师批语：
HTML部分：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <link rel="stylesheet" href="../321/321.css"> <title>321练习</title> </head> <body> <table width="500" align="center" border="1" cellspacing="0" cellpadding="6"> <tr> <td>1</td> <td class="tdcol">2</td> <td>3</td> </tr> <tr> <td>4</td> <td>5</td> <td class="tdcol">6</td> </tr> <tr> <td class="tdcol">7</td> <td>8</td> <td>9</td> </tr> </table> <div id="item"> <table width="500" align="center" border="1" cellspacing="0" cellpadding="6"> <tr> <td>2018年好好学习</td> </tr> </table> </div> </body> </html>
点击 "运行实例" 按钮查看在线实例
CSS部分：
td{
width:120px;
height:50px;
text-align: center;
color:#4031C5;
}
.tdcol{
color:red;
background:#af0;
}
#item{
padding-top: 10px;
}
#item td{
color:#0C9600;
}点击 "运行实例" 按钮查看在线实例
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