/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: tiar3000 https://cdn.slidesharecdn.com/profile-photo-tiar3000-48x48.jpg?cb=1523117384 محمود رضا ... كلية علوم الاسكندية