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1、I单项选择1抽样频率a. sampling rate b. repetition rate c. sampling frequency答案：c2数字通信a. digital communication b. digital transmission c. transmission path答案：a3帧格式a. synchronization word b. frame format c. reverse operation答案：b4噪声功率a. noisy environment b. signal levels c. noise power答案：c5含噪声的环境a. signal level
2、s b. noisy environment c. noise power答案：b6模拟信号a. speech channel b. analog signal c. amplitude value答案：b7脉冲流a. stream of pulses b. receiving terminal c. terrestrial system答案：a8传输路由a. transmission path b. transmission qualityc. binary transmission答案：a9互联网a. network resource b. Internet c. interconnect
3、ed systems答案：b10命令a. copy b. host c. command答案：c11拷贝a. address b. mouse c. copy答案：c12搜索工具a. user interface b. searching tools c. electronic mail答案：b13存取a. access b. protocol c. copy答案：a14网络资源a.textual messages b. remote terminals c. network resources答案：c15文本信息a. information services b. hypertext pro
4、tocolc. textual messages答案：c16频谱a. bandwidth b. spread spectrum c. frequency band答案：b17移动手机a. mobile subscriber b. mobile unit c. service performance答案：b18频带a. frequency spectrum b. frequency band c. spread spectrum答案：b19蜂窝交换机a. cellular switch b. cellular site c. mobile unit答案：a20单边带a. single-sideb
5、and b. bandwidth c. service area答案：a21服务区a. service area b. service performance c. service capability答案：a22移动用户a. mobile unit b. mobile subscriber c. mobile transceiver答案：b23微处理器a. subsystems b. utilization c. microprocessor答案：c24无线机架a. radio cabinet b. antenna c. mobile unit答案：a25电路交换a. packet swit
6、ching b. circuit switching c. message switching答案：b26分组交换a. packet switching b. circuit switching c. message switching答案：a27报文交换a. packet switching b. circuit switching c. message switching答案：c28专用电路a. dedicated circuit b. error control c. return signal答案：a29突发性a. bursty b. random c. header答案：a30传输时
7、延a. destination address b. transmission delay c. return signal答案：b31中间交换设备a. given maximum b. intermediate switching equipmentc. store-and-forward manner答案：b32子网a. header b. subnet c. busty答案：b33. 公众电信网a.public telecommunication networkb. intermediate switching nodec. circuit- switched network答案：a34
8、.半双工的a. full-duplex b. half-duplex c. external call答案：b35. 端局a. toll center b. end office c. tandem switch答案：b36. 外部呼叫a. external call b. data traffic c. toll center答案：a37.链路a. trunk b. link c. route答案：b38.交换节点a. intermediate switching node b. voice-frequency circuitc. switching node答案：c39.音频电路a. te
9、lephone subscriber b. voice-frequency circuitc. two wire connection答案：b40.拓扑a. internodes b. topology c. route答案：b41.二线连接a. data traffic b. end office c. two wire connection答案：c42.数据流量a. data traffic b. tandem switch c. toll center答案：a43.全球通信a. interface equipment b. global communicationc. communica
10、tion carriers答案：b44.脉码调制a. pulse code modulation b. voice encoding c. open network答案：a45.接口设备a. switching equipment b. transmission mediumc. interface equipment答案：c46.综合业务数字网a)end-to-end digital connectivityb. international organization for standardizationc. integrated services digital network答案：c47
11、.通信载体a. communication carriers b. transmission mediumc. interface equipment答案：a48.系统结构a. infrastructure c. flexibility d. basic access答案：a49.蜂窝式移动电话a. cellular switch b. cellular mobile telephonec. cellular site答案：b50.数据传输a. data transmission b. transmission error c. error flag答案：a51.传号电平a. space le
12、vel b. logical level c. mark level答案： c52.接收机的定时a. intersymbol space b. serial interface c. receiver timing答案：c53.明显的缺点a. transmission error b. obvious disadvantagec. error flag答案：b54. 起始位a. start bit b. stop bit c. parity bit答案：a55.空号电平a. mark level b. space level c. the idle state答案：b56.控制比特a. bin
13、ary data b. local clock c. control bit答案：c57.串行接口a. data stream b. CRT terminal c. serial interface答案：c58.发送器和接收器a. transmitter and receiver b. receiver timingc. duration of T seconds答案：a59.二进制数据a. binary data b. data stream c. data transmission答案：a60.高速电子开关a. the voice channel b. the repetition ratec. a high-speed switch答案：cII.根据所给英文选择合适的答案1digital
