abstract：<html><body><table border="1"><tr> <td>100</td></tr></table><h4>一行三列：</h4><table border="1"><tr>
<html>
<body>
<table border="1">
<tr>
<td>100</td>
</tr>
</table>
<h4>一行三列：</h4>
<table border="1">
<tr>
<td>100</td>
<td>200</td>
<td>300</td>
</tr>
</table>
<h4>两行三列：</h4>
<table border="1">
<tr>
<td>100</td>
<td>200</td>
<td>300</td>
</tr>
<tr>
<td>400</td>
<td>500</td>
<td>600</td>
</tr>
</table>
</body>
</html>
