End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
http://powerfile.farafile.ir/file/35632/جزوه-مکانیک-سیالات-استاد-حبیب-زاده-(دانشگاه-امیرکبیر)