【问题一】(12分)
以下是网页部分源代码，请将填写___(n)___处的空格。
<html>
<head>
___(1)___
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link href="./inc/style.css" rel="stylesheet" type="text/css">
<style type="text/css"> <!-- body { margin-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; }
.style1 { font-family: Arial, Helvetica, sans-serif; color: #FFFFFF; }
.style2 {color: #FFFFFF}
--> </style>
</head>
<body>
<br>
<table width="700" height="420" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#dddddd">
<tr>
<td valign="top"> <table width="700" height="420" border="0" cellpadding="0" cellspacing="0" bgcolor="#ffffff">
<tr>
<td valign="top"> <table width="700" border="0" cellpadding="5" cellspacing="0" bgcolor="#f1f1f1">
<tr> <td>欢迎使用员工管理系统 </td> </tr>
</table>
<table width="700" height="80" border="0" cellpadding="0" cellspacing="0">
<tr>
<td> <___(2)___="./images/logotitle.gif" width="700" height="80"> </td>
</tr>
</table>
<table width="700" height="38" border="0" cellpadding="0" cellspacing="0" background="./images/bg_link.gif">
<tr> <td> </td> </tr>
</table>
<table width="700" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="280"> <IMG height="80" src="./images/logo.gif" width="389"> </td>
<td valign="bottom">
<form method="post" name="Form1" ___(3)___="login.asp" >
<table width="300" border="0" cellspacing="0" cellpadding="3">
<tr>
<td>用户名称： </td>
<td> <input name="uid" maxlength="14" size="14"> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>用户密码： </td>
<td> <input type="___(4)___" name="pwd" maxlength="6" size="14"> </td>
<td> </td>
<td> <input type="___(5)___" border="0" height="20" src="./images/login.gif" width="54"> </td>
</tr>
___(6)___
</form>
</td>
</tr>
</table>
<table width="700" border="0" cellpadding="0" cellspacing="0" bgcolor="#038d59">
<tr> <td align="middle"> <span class="style1">COPYRIGHT@2007 ALL RIGHTS RESERVED </span> </td> </tr>
<tr> <td align="middle"> </td> <td> </td> </tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>
【问题二】(3分)
网页中使用了CCS，请问什么是CCS，有什么作用?
