(Introduction of the five major components of mobile phones From wired to wireless, from narrow to broadband, from long distance to short distance, from analog to digital, from circuit switching to packet switching, from 1G/2G/2.5G/2.75G to 3G/3.5G and even 4G ...communication technology is reinventing itself like never before.)
发表于 2022-8-3 10:40:14
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