网页中的上标和下标
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<TITLE>网页特效演示，网页中的上标和下标</TITLE>
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<td width="18" height="44" rowspan="2"><b><font size="7"><i>H</i></b></td>
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<td width="28" height="44" rowspan="2"><b><i><font size="7">O</i></b></td>
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<td width="25" height="34"><b><i><font size="5">2</i></b></td>
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