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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> </head> <body> <form action="demo-form.php" method="get"> <input type="checkbox" name="vehicle" value="Bike"> I have a bike<br> <input type="checkbox" name="vehicle" value="Car" checked="checked"> I have a car<br> <input type="submit" value="提交"> </form> </body> </html>