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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
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<title>无标题文档</title>
<style>
.tu1{ background:url(6.png) no-repeat center; 290px; height:427px; }
.tu1:hover {transform: rotateY(180deg);transition: all 1.2s ease; background:url(7.jpg) no-repeat center;}
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