For an initial service, a 10 megahertz-wide band of frequencies will be needed.初始服务需要10兆赫宽的频带。Of an electronic circuit or device; having an output proportional to input; amplifying or attenuating all frequencies equally....
For an initial service, a 10 megahertz-wide band of frequencies will be needed.初始服务需要10兆赫宽的频带。If the frequencies are low, this approach cannot be used.若频率很低时, 这种方法就不能使用.The electromagnetic spectrum covers an enormous ran...