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://ppt-r.farafile.ir/file/48272/جداسازی-مس-و-نیکل-به-روش-الکتروگراویمتری-با-پتانسیل-خروجی-ثابت