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

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(16)frequencies　available　for　use　at　any　time　in　the　specified　range.　Devices　using(17)spread　spectrum(DSSS)　communicate　by(18)each　byte　of　data　into　several　parts　and　sending　them　concurrently　on　different(19).　DSSS　uses　a　lot　of　the　available(20),　about　22　megahertz(MHz).
选项 A、direct-sequence
B、discrete-sequence
C、duplicate-sequence
D、dedicate-sequence
答案A
解析
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