单项选择题

The maximum data rate of any single wireless link can be described by the shannon’s theorem which is related tot he（）inhertz，and the noise on the channel.

A.signal frequency
B.bandwidth
C.carrier frequency
D.noise frequency

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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
单项选择题
Wireless telecommunications networks are generally implemented and administered using（）communication

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