多个DropDownList，为啥不能连用
多个DropDownList，为什么不能连用
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ema.aspx.cs" Inherits="ema" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>设备维护</title>
<style type="text/css">
.style3
{
width: 163px;
}
.style4
{
width: 110px;
}
.style5
{
height: 21px;
width: 110px;
}
.style7
{
width: 158px;
}
#table1
{
width: 883px;
}
.style10
{
height: 13px;
width: 178px;
}
.style11
{
width: 137px;
height: 22px;
}
.style12
{
width: 888px;
}
.style14
{
width: 318px;
height: 22px;
}
.style15
{
height: 22px;
width: 100px;
}
.style20
{
width: 238px;
}
.style21
{
width: 172px;
}
.style22
{
width: 83px;
}
.style23
{
width: 116px;
}
.style25
{
width:45px;
}
#table2
{
width: 774px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<P align="center"> </p>
<div>
<table >
<table class="border" cellSpacing="0" cellPadding="5" border="0"
style="width: 924px; height: 236px;">
<TR>
<td ><P align="center"> 通讯设备检查结果 </p></td>