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布丁学网发布2022通信工程师冲刺密卷共用题干题正确答案(08.11)，更多通信工程师的答案解析请访问布丁学网计算机类考试频道。
1. [单选题]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
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