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    bootstrap collapse

    <!doctype html> <html> <head> <meta charset="utf-8"> <title>联想控股</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link href="css/bootstrap.css" rel="stylesheet" type="text/css"> <script src="http://code.jquery.com/jquery.js"></script> <script src="js/bootstrap.js"></script> </head> <body>

    Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo.
    Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo.
    Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo.
    </body> </html>

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