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<h2>响应式图片</h2>
<p>响应式图片会自动适配各种尺寸的屏幕。</p>
<p>通过重置浏览器大小查看效果:</p>
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<img src="http://www.wfuyu.com/wp-content/uploads/2016/04/trolltunga.jpg" alt="Norway" width="1000" height="300">
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