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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> </head> <body> <h1 align="center">这是标题 1</h1> <h2 align="left">这是标题 2</h2> <h3 align="right">这是标题 3</h3> <h4 align="justify">这是标题 4</h4> </body> </html>