【我国成功发射中星3B卫星】5月20日讯，今天，我国在文昌航天发射场使用长征七号改运载火箭，成功将中星3B卫星发射升空，卫星顺利进入预定轨道，发射任务获得圆满成功。该卫星主要用于为用户提供话音、数据、广播电视传输业务。

Core Points - China successfully launched the Zhongxing 3B satellite using the Long March 7 modified carrier rocket from the Wenchang Space Launch Site [1] - The satellite has successfully entered its designated orbit and the launch mission is considered a complete success [1] - The primary purpose of the satellite is to provide voice, data, and broadcasting television transmission services to users [1]