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正确
<style>
body {
background-image: url('img1.gif');
@(15): @(10);
background-repeat: no-repeat;
}
</style>
<body>
<h1>This is a heading</h1>
<p>This is a paragraph</p>
<p>This is a paragraph</p>
</body>
<style>
body {
background-image: url('img1.gif');
background-size: 100px 80px;
background-repeat: no-repeat;
}
</style>
<body>
<h1>This is a heading</h1>
<p>This is a paragraph</p>
<p>This is a paragraph</p>
</body>
不正确
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<style>
body {
background-image: url('img1.gif');
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