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console 命令行工具 X clear 

                    

                        
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console

            
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <table border="1" width="500" cellspacing="0" cellpadding="5" rules="all" frame="box">
        <caption>课程表</caption>
        <thead bgcolor="pink">
            <tr>
                <th>星期一</th>
                <th>星期二</th>
                <th>星期三</th>
                <th>星期四</th>
                <th>星期五</th>
            </tr>
        </thead>
        <tr>
            <td rowspan="2" align="center">语文</td>
            <td align="center">数学</td>
            <td align="center">化学</td>
            <td align="center">英语</td>
            <td align="center">生物</td>
        </tr>
        <tr>
            <td align="center">数学</td>
            <td align="center">化学</td>
            <td align="center">英语</td>
            <td align="center">生物</td>
        </tr>
        <tr>
            <td align="center" colspan="5">课间活动</td>
        </tr>
        <tr>
            <td align="center">语文</td>
            <td align="center">数学</td>
            <td align="center">化学</td>
            <td align="center">英语</td>
            <td align="center">生物</td>
        </tr>

        <tr>
            <td align="center">语文</td>
            <td align="center">数学</td>
            <td align="center">化学</td>
            <td align="center">英语</td>
            <td align="center">生物</td>
        </tr>
    </table>
</body>

</html>