SMS was originally designed as part of（），but is now available on a wide range of networks，including 3G and 4G networks.
A: PHS
B: AMPS
C: GSM
D: GPRS
A: PHS
B: AMPS
C: GSM
D: GPRS
举一反三
- According to the classification of transmission media, LAN can be divided into baseband networks and broadband networks.
- 以下（）技术属于第二代移动通信技术。 A: TACS B: AMPS C: IS-95CDMA D: GSM E: WCDMA F: CDMA2000 G: GPRS H: EDGE
- There are a wide range of famous Sichuan dishes, including ___________________________________________.
- With commercialization of internet, less and less networks were developed in different part of the world.
- GSM的2.5代通信系统是（）。 A: GPRS B: AMPS C: TACS D: GPS