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://dlweb.farafile.ir/file/46398/آموزش-محاسبه-ارتعاش-کف-های-سازه-با-نرم-افزار-etabs2016