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<!DOCTYPE html> <html> <head> <style> h1 { font-size: 250%; } h2 { font-size: 200%; } p { font-size: 100%; } </style> </head> <body> <h1>这是标题 1</h1> <h2>这是标题 2</h2> <p>这是一个段落。</p> </body> </html>