/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: saminictoretto https://cdn.slidesharecdn.com/profile-photo-saminictoretto-48x48.jpg?cb=1523706834 ระยะเวลาพิสูจน์ความเป็นENGINEER Live and Learn