编辑下面的代码:【加编码】
<html> <head> <style> p.ex1 {margin-left:2cm;} </style> </head> <body> <p>A paragraph with no margins specified.</p> <p class="ex1">A paragraph with a 2cm left margin.</p> <p>A paragraph with no margins specified.</p> </body> </html>
结果: 【此窗口】 帮助?
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