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正确
<html>
<body @(5)="@(17);"> <h1>This is a heading</h1> <p>This is a paragraph.</p> </body> </html>
<html>
<body style="text-align:center;"> <h1>This is a heading</h1> <p>This is a paragraph.</p> </body> </html>
<html>
<body style='text-align:center;'> <h1>This is a heading</h1> <p>This is a paragraph.</p> </body> </html> 不正确
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