xxxxxxxxxx<html><head> <meta charset="utf-8"> <title>W3Cschool(w3cschool.cn)</title> </head><body><form action="/statics/demosource/demo-form.php" method="get"> <input type="radio" name="sex" value="Male"> Male<br> <input type="radio" name="sex" value="Female" checked="checked"> Female<br> <input type="submit" value="提交"></form></body></html>