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4G - Wikipedia, the free encyclopedia
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日期：2025-11-22
A 4G system, in addition to the usual voice and other services of 3G, provides .... since the first move from 1981 analog (1G) to digital (2G) transmission in 1992. ...... or US$58,000,000, on developing 4G and even 5G technologies, with the goal ......看更多
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