<html>
<body>
<div style="width:340pxbackground-color:#333margin:0 auto">
<div style="width:30%height:30pxbackground-color:#F00float:left">左</div>
<div style="width:20%height:30pxbackground-color:#F0Ffloat:right">右</div>
<div style="clear:both"></div>
</div>
</body>
</html>
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