为什么在ie下表格出现缝隙（急，在线等）
<style type= "text/css "> <!--
*{margin:0px;
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#head{
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background-color:#0056AD;}
#main{
margin:0px auto;
width:722px;
height:1046px;
background-color:#0056AD;
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form{margin:0px;
padding:1px;}
span{margin-top:12px;
margin-left:150px;
color:#FFFFFF;
font-size:14px;
display:block;
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table{
width:382px;
margin-top:10px;
margin-left:150px;
border-right:1px solid #CCCCCC;
border-bottom:1px solid #CCCCCC;
font-size:12px;}
td{border-top:1px solid #CCCCCC;
border-left:1px solid #CCCCCC;
background-color:#FFFFFF;}
table#fir{height:260px;}
table#sec {height:686px;
}
.blue{
background-color:#4B87C3;}
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a:visited{color:#FFFFFF;
text-decoration:none;}
a:hover{color:#FFFFFF;
text-decoration:underline;}
--> </style>
</head>
<body>
<div id= "head "> <img src= "image/head.jpg " /> </div>
<div id= "main ">
<form id= "form1 " name= "form1 " method= "post " action= " ">
<span> 一.基本情况调查 </span>
<table cellpadding= "0 " cellspacing= "0 " id= "fir " >
<tr >
<td width= "10% " class= "blue "> 1 </td>
<td class= "blue "> </td>
</tr>
<tr>
<td> 2 </td>
<td> </td>
</tr>
<tr>
<td> 3 </td>
<td> </td>
</tr>
<tr>
<td> 4 </td>
<td> </td>
</tr>
<tr>
<td > 5 </td>
<td > </td>
</tr>
<tr>
<td class= "blue "> 6 </td>
<td class= "blue "> 6 </td>
<tr>
<tr>
<td> 7 </td>
<td> 7 </td>
<tr>
<td> 8 </td>
<td> </td>
</tr>
<tr>
<td> 9 </td>
<td> </td>
</tr>
<tr>
<td> 10 </td>
<td> </td>
</tr>
</table>
<span> 二.关于校园文化认知理解(多选) </span>
<table cellpadding= "0 " cellspacing= "0 " id= "sec " >
<tr >
<td width= "10% " class= "blue "> </td>
<td class= "blue "> 1 </td>
</tr>
<tr>
<td> </td>
<td> 2 </td>
</tr>
<tr>
<td> </td>
<td> 3 </td>
</tr>
<tr>
<td> </td>
<td> 4 </td>
</tr>
<tr>
<td> </td>
<td> 5 </td>
</tr>
<tr>
<td > </td>
<td > 6 </td>
</tr>
<tr>
<td class= "blue "> </td>
<td class= "blue "> 7 </td>
<tr>
<tr>
<td> </td>
<td> 8 </td>
</tr>
<tr>
<td> </td>
<td> 9 </td>
</tr>
<tr>
<td> </td>
<td> 10 </td>
</tr>
<tr>
<td> </td>
<td> 11 </td>
</tr>
<tr>
<td> </td>
<td> 12 </td>
</tr>
<tr>
<td> </td>
<td> 13 </td>
</tr>
<tr>
<td class= "blue "> </td>
<td class= "blue "> 14 </td>
<tr>
<tr>
<td> </td>
<td> 15 </td>
</tr>
<tr>
<td> </td>
<td> 16 </td>
</tr>
<tr>
<td> </td>
<td> 17 </td>
</tr>
<tr>
<td class= "blue "> </td>
<td class= "blue "> 18 </td>
</tr>
<tr>
<td> </td>
<td> 19 </td>
</tr>
<tr>
<td > </td>
<td > 20 </td>
<tr>
<tr>
<td> </td>
<td> 21 </td>
</tr>
<tr>
<td> </td>
<td> 22 </td>
</tr>
<tr>
<td class= "blue "> </td>
<td class= "blue "> 23 </td>
</tr>
<tr>
<td > </td>
<td > 24 </td>
<tr>
<tr>
<td> </td>
<td> 25 </td>
</tr>
<tr>
<td> </td>
<td> 26 </td>
</tr>
<tr>
<td> </td>
<td> 27 </td>
</tr>
</table>
</form> </div>
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</body>
为什么第7 14 20 24个表格出现蓝色的底边？怎么解决。。。
[解决办法]
那些行的 </tr> 写成 <tr> 了
