際際滷shows by User: rafaeltorres1232 / http://www.slideshare.net/images/logo.gif 際際滷shows by User: rafaeltorres1232 / 際際滷Share feed for 際際滷shows by User: rafaeltorres1232 https://public.slidesharecdn.com/v2/images/profile-picture.png Un experto es una persona que ha cometido todos los errores que se pueden cometer en un determinado campo. Niels Bohr