单项选择题

As with all ITU standards，reduce energy consumption is a key factor taken into account at development stage.Indeed NGN sare believed to offer significant saving（）traditional networks.

A.of
B.over
C.at
D.in

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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 to the bandwidth inhertz，and the （） on the channel.

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

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