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<head>
<style>
table{border-collapse:collapse;border-top:3px solid #000;border-bottom:3px solid #000;}
.notVert{border:none; }
td,th{
width:60px;
border-right:1px solid #aaa;
border-bottom:1px solid #aaa;
text-align:center;
font-size:16px;
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th{font-size:16px;font-weight:normal}
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strong{color:red; }
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<body>
<p>
<strong>四周（上下左右都不封闭）</strong>
</p>
<table cellspacing="0" cellpadding="2" class="notVert">
<tr>
<th>一月</th>
<th>二月</th>
<th>三月</th>
<th class="last">总计</th>
</tr>
<tr>
<td>29</td>
<td>38</td>
<td>65</td>
<td class="last">24</td>
</tr>
<tr>
<td>26</td>
<td>47</td>
<td>58</td>
<td class="last">4</td>
</tr>
<tr class="lastTr">
<td>56.45</td>
<td>665</td>
<td>76</td>
<td class="last">8</td>
</tr>
</table>
<p>
<strong>常用型，左右不封闭</strong>
</p>
<table cellspacing="0" cellpadding="2">
<tr>
<th>一月</th>
<th>二月</th>
<th>三月</th>
<th class="last">总计</th>
</tr>
<tr>
<td>22</td>
<td>112</td>
<td>52</td>
<td class="last">4</td>
</tr>
<tr>
<td>15</td>
<td>265</td>
<td>39</td>
<td class="last">4</td>
</tr>
<tr class="lastTr">
<td>72</td>
<td>43</td>
<td>521</td>
<td class="last">8</td>
</tr>
</table>
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