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  3. Wireless telecommunications networks are generally implemented and administered using（90） communication．This implementation take

Wireless telecommunications networks are generally implemented and administered using（90） communication．This implementation take

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问题 Wireless telecommunications networks are generally implemented and administered using（90） communication．This implementation takes place at the（91）level of OSI model network structure．
(90)
选项 A、microwave
B、radio
C、FM
D、AM
答案B
解析
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