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<td><a href="html 练习.html" target="mframe"> 第一<a></td>
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<td><a href="button.html" target="mframe"> 第二<a></td>
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<td>第三</td>
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<td>第四</td>
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原文：http://www.cnblogs.com/lushixiong/p/4479559.html