<!DOCTYPE html><html manifest="存储缓存信息.appcache"> <head> <meta name="keywords" content="百度，百度一下，百度一下 你就知道"/> <meta name="description" content="通过搜索关键字，得到您想知道的答案"/> <meta name="author" content="secret"/> <meta name="application-name" content="百度一下，你就知道"/> <meta name="generator" content="txt"/> <meta http-equiv="content/type" content="text/html,charset=UTF-8"/> <meta http-equiv="refresh" content="500000,url=www.baidu.com"/> <meta http-equiv="expires" content="09 Dec 2016"/> <title>百度一下，你就知道</title> <base href="H:\个人\html\baidu\"> <link rel="icon" href="baidu\smallsign.png" target="_self"> <link rel="stylesheet" href="baidu.css" type="text/css"> <script> document.creatElement("header"); document.creatElement("nav"); </script> </head> <body> <header> <nav> <span><a href="https://www.nuomi.com/">糯米</a></span> <span><a href="http://news.baidu.com/">新闻</a></span> <span><a href="https://www.hao123.com/">hao123</a></span> <span><a href="http://map.baidu.com/">地图</a></span> <span><a href="http://v.baidu.com/">视频</a></span> <span><a href="http://tieba.baidu.com/">贴吧</a></span> <span><a href="#">登录</a></span> <div id="set"> <span><a href="">设置</a></span> <div id="setdrow"> <div id="trangle"></div> <div id="square"> <a href="#">搜索设置</a> <a href="#">高级搜索</a> <a href="#">关闭预测</a> <a href="#">搜索历史</a> </div> </div> </div> <div id="buttondrow"> <button>更多产品</button> <div id="menudrow"> <span id="more">更多产品</span> <hr color="#e8e8e8" size="1px"> <img src="1.png" alt="music"> <a href="">音乐</a> <hr color="#e8e8e8" size="1px"> <img src="2.png" alt="picture"> <a href="">图片</a> <hr color="#e8e8e8" size="1px"> <img src="3.png" alt="knowlege"> <a href="">知道</a> <hr color="#e8e8e8" size="1px"> <img src="4.png" alt="words"> <a href="">文库</a> <hr color="#e8e8e8" size="1px"> <img src="5.png" alt="loundlist"> <a href="">风云榜</a> <hr color="#e8e8e8" size="1px"> <a href="">全部产品>></a> </div> </div> </nav> </header> <div id="picture"> <img src="sign.png" alt="百度一下，你就知道" align="center"> </div> </body></html>为什么header nav我都设置dispaly：block;可是底下id=picture还是和他俩在一行，为什么呢，即使我在header外面还加一层div但还是在一行
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