SMSwas originally designed as part of(　)，but is now available on a wide range of networks ，including 3G and 4G networks.

题库:中级通信工程师 类型:最佳选择题 时间:2020-05-27 15:30:52 免费下载:《2017年中级通信工程师(综合能力)上午真题》Word试卷

SMSwas 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

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