/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: mdkamruzzaman7315 https://cdn.slidesharecdn.com/profile-photo-mdkamruzzaman7315-48x48.jpg?cb=1601372802 I am a lecturer. Department of Physics. Begum Rokeya University, Rangpur.