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://9lib.co/document/z3dj8d58-內藏式永磁同步馬達之設計與同動控制許潔一陳盛基.html