The third generation mobile communication system (3G) ________.
A、Adopts analog and frequency division multiple access technology, voice only;
B、Adopts digital technology to improve quality and confidentiality;
C、Adopts CDMA technology to transmit voice, data and multimedia information;
D、Adopts TD-LTE and FDD-LTE technology to quickly transmit multimedia information
发布时间:2026-01-24 12:41:25