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.
https://123dok.co/document/dy4ww49q-강원도립대학교-소방환경방재과-학습자료실-고도처리공정운전-고도처리시설운전-소방환경방재과-학과자료실-학습자료실.html