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请作答71题:Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of   71  . This, in turn, limits the data rate that can be carried on the transmission   72  . A square wave has an infinite number of frequency components and hence an infinite   73   .However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the    74   in this waveform is in the first few frequency components. In general, any digital waveform will have   75   bandwidth. If we attempt to transmit this waveform as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.

A
frequencies
B
connections
C
diagrams  
D
resources
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答案:

A

解析:

在这段话中,关键词是"band of frequencies",意为频率的波段。尽管给定的波形可能包含非常广泛的频率范围,但实际上任何传输系统只能容纳有限的频率波段。因此,选项A “frequencies”(频率)是正确的答案。其他选项如connections(连接)、diagrams(图表)和resources(资源)与这段话的主题不符。

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