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<!DOCTYPE html> <html> <head> <style> h1 { text-align: center; } h2 { text-align: left; } h3 { text-align: right; } </style> </head> <body> <h1>标题 1（居中）</h1> <h2>标题 2（左）</h2> <h3>标题 3（右）</h3> <p>上面的三个标题分别居中、左对齐和右对齐。</p> </body> </html>