单项选择题

This implementation takes place at the（）level of OSI model network structure.

A.physical
B.link
C.network
D.transport

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单项选择题

Wireless telecommunications networks are generally implemented and administered using（）communication

A.microwave
B.radio
C.FM
D.AM

单项选择题

基带”英文通常翻译为（）。

A.side band
B.base band
C.dual band
D.single band

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