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://faraposhe.farafile.ir/file/38833/جزوه-موازنه-مواد-و-انرژی--استاد-مولایی--دانشگاه-شریف