In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.Spread spectrum s

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问题 In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.Spread spectrum simply means that data is sent in small pieces over a number of the(71)frequencies availablefor use at any time in the specified range. Devices using(72)spread spectrum(DSSS)communicate by(73)each byte of data into several parts and sending them concurrently on different(74). DSSS uses a lot of the available(75), about 22 megahertz(MHz).

选项 A、rate
B、velocity
C、bandwidth
D、period

答案C

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