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<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档 </title>
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aaa[3]=document.getElementById("a4");
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<body>
<a href="javascript:a()">sss </a>
<a href="javascript:b()">bbb </a>
<table border="1">
<tr id="a1" style="display:block;">
<td>111 </td>
</tr>
<tr id="a2" style="display:block;">
<td>222 </td>
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<td>333 </td>
</tr>
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<td>444 </td>
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<td>555 </td>
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</table>
</body>
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