/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: bamboophysics https://public.slidesharecdn.com/v2/images/profile-picture.png รัà¸�พ่อà¸�ับà¹�ม่à¸È¨¸°à¸„ะ