/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: sciahmedelmasry https://cdn.slidesharecdn.com/profile-photo-sciahmedelmasry-48x48.jpg?cb=1523441533 My name is Ahmed Elmasry I'm studying at faculty of Science Al-Azhar university Department of Chemistry !! and working at SIFE Azhar