際際滷shows by User: tommanning549 / http://www.slideshare.net/images/logo.gif 際際滷shows by User: tommanning549 / 際際滷Share feed for 際際滷shows by User: tommanning549 https://cdn.slidesharecdn.com/profile-photo-tommanning549-48x48.jpg?cb=1617623605 Professor of Chemistry, Valdosta State University, Georgia