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 （1） frequencies available for use at any time in the specified range. Devices using （2） spread spectrum(DSSS) communicate by （3） each byte of data into several parts and sending them concurrently on different （4） . DSSS uses a lot of the available （5） , about 22 megahertz(MHz).

（4）处应选择（）

题库:初级程序员 类型:最佳选择题 时间:2017-07-03 12:00:37 免费下载:《单项选择》Word试卷

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 （1） frequencies available for use at any time in the specified range. Devices using （2） spread spectrum(DSSS) communicate by （3） each byte of data into several parts and sending them concurrently on different （4） . DSSS uses a lot of the available （5） , about 22 megahertz(MHz).

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