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<h3>试题要求:</h3>
<p>
.点击每组的标题时，显示该标题下的面板；同时隐藏其他的面板。<br />
.页面加载完毕后默认显示第一个标题下的面板。<br />
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</div> <dl id="panels">
<dt>DotNet23</dt>
<dd>英雄们，该写作业了......</dd>
<dt>DotNet24</dt>
<dd>其实它只是个传说........</dd>
<dt>DotNet25</dt>
<dd>未完，待续......</dd>
<dt>DotNet26</dt>
<dd>此处省略一万字......</dd>
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