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改进型移动电话系统
20 世纪60年代美国的大区制系统,现已被蜂窝系统取代
telecom.
Improved Mobile Telephone Service
改进型移动电话系统
el.
improved mobile telephone system
改进型移动电话系统
20 世纪60年代美国的大区制系统,现已被窝系统取代
telecom.
Improved Mobile Telephone Service
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