通信英语

I单项选择1．抽样频率a.samplingrateb.repetitionratec.samplingfrequency答案：c2．数字通信a.digitalcommunicationb.digitaltransmissionc.transmissionpath答案：a3．帧格式a.synchronizationwordb.frameformatc.reverseoperation答案：b4．噪声功率a.noisyenvironmentb.signallevelsc.noisepower答案：c5．含噪声的环境a.signallevelsb.noisyenvironmentc.noisepower答案：b6．模拟信号a.speechchannelb.analogsignalc.amplitudevalue答案：b7．脉冲流a.streamofpulsesb.receivingterminalc.terrestrialsystem答案：a8．传输路由a.transmissionpathb.transmissionqualityc.binarytransmission答案：a9．互联网a.networkresourceb.Internetc.interconnectedsystems答案：b10．命令a.copyb.hostc.command答案：c11．拷贝a.addressb.mousec.copy答案：c12．搜索工具a.userinterfaceb.searchingtoolsc.electronicmail答案：b13．存取a.accessb.protocolc.copy答案：a14．网络资源a.textualmessagesb.remoteterminalsc.networkresources答案：c15．文本信息a.informationservicesb.hypertextprotocolc.textualmessages答案：c16．频谱a.bandwidthb.spreadspectrumc.frequencyband答案：b17．移动手机a.mobilesubscriberb.mobileunitc.serviceperformance答案：b18．频带a.frequencyspectrumb.frequencybandc.spreadspectrum答案：b19．蜂窝交换机a.cellularswitchb.cellularsitec.mobileunit答案：a20．单边带a.single-sidebandb.bandwidthc.servicearea答案：a21．服务区a.serviceareab.serviceperformancec.servicecapability答案：a22．移动用户a.mobileunitb.mobilesubscriberc.mobiletransceiver答案：b23．微处理器a.subsystemsb.utilizationc.microprocessor答案：c24．无线机架a.radiocabinetb.antennac.mobileunit答案：a25．电路交换a.packetswitchingb.circuitswitchingc.messageswitching答案：b26．分组交换a.packetswitchingb.circuitswitchingc.messageswitching答案：a27．报文交换a.packetswitchingb.circuitswitchingc.messageswitching答案：c28．专用电路a.dedicatedcircuitb.errorcontrolc.returnsignal答案：a29．突发性a.burstyb.randomc.header答案：a30．传输时延a.destinationaddressb.transmissiondelayc.returnsignal答案：b31．中间交换设备a.givenmaximumb.intermediateswitchingequipmentc.store-and-forwardmanner答案：b32．子网a.headerb.subnetc.busty答案：b33.公众电信网a.publictelecommunicationnetworkb.intermediateswitchingnodec.circuit-switchednetwork答案：a34.半双工的a.full-duplexb.half-duplexc.externalcall答案：b35.端局a.tollcenterb.endofficec.tandemswitch答案：b36.外部呼叫a.externalcallb.datatrafficc.tollcenter答案：a37.链路a.trunkb.linkc.route答案：b38.交换节点a.intermediateswitchingnodeb.voice-frequencycircuitc.switchingnode答案：c39.音频电路a.telephonesubscriberb.voice-frequencycircuitc.twowireconnection答案：b40.拓扑a.internodesb.topologyc.route答案：b41.二线连接a.datatrafficb.endofficec.twowireconnection答案：c42.数据流量a.datatrafficb.tandemswitchc.tollcenter答案：a43.全球通信a.interfaceequipmentb.globalcommunicationc.communicationcarriers答案：b44.脉码调制a.pulsecodemodulationb.voiceencodingc.opennetwork答案：a45.接口设备a.switchingequipmentb.transmissionmediumc.interfaceequipment答案：c46.综合业务数字网a)end-to-enddigitalconnectivityb.internationalorganizationforstandardizationc.integratedservicesdigitalnetwork答案：c47.通信载体a.communicationcarriersb.transmissionmediumc.interfaceequipment答案：a48.系统结构a.infrastructurec.flexibilityd.basicaccess答案：a49.蜂窝式移动电话a.cellularswitchb.cellularmobiletelephonec.cellularsite答案：b50.数据传输a.datatransmissionb.transmissionerrorc.errorflag答案：a51.传号电平a.spacelevelb.logicallevelc.marklevel答案：c52.接收机的定时a.intersymbolspaceb.serialinterfacec.receivertiming答案：c53.明显的缺点a.transmissionerrorb.obviousdisadvantagec.errorflag答案：b54.起始位a.startbitb.stopbitc.paritybit答案：a55.空号电平a.marklevelb.spacelevelc.theidlestate答案：b56.控制比特a.binarydatab.localclockc.controlbit答案：c57.串行接口a.datastreamb.CRTterminalc.serialinterface答案：c58.发送器和接收器a.transmitterandreceiverb.receivertimingc.durationofTseconds答案：a59.二进制数据a.binarydatab.datastreamc.datatransmission答案：a60.高速电子开关a.thevoicechannelb.therepetitionratec.ahigh-speedswitch答案：cII.根据所给英文选择合适的答案1．digitalcommunicationa.全球通信b.公共通信载体c.数字通信答案：c2．voiceencodingtechniquesa.语音编码技术b.脉冲c.脉冲编码调制答案：a3．basicaccesssignalingratea.大量的接口设备b.基本接入信令速率c.统一的接入答案：b4．theInternationalOrganizationforStandardizationa.综合业务数字网b.ISDN的标准和系统结构c.国际标准化组织答案：c5．end-to-enddigitalconnectivitya.基本接入信令速率b.端对端的数字连接c.语音编码技术答案：b6．progressiveapplicationofdigitaltechnologya.由于传输媒体导致的质量下降b.4KHz话路中所固有的带宽限制c.数字技术的逐步应用答案：c7．enhancedqualitya.高质量b.带宽的限制c.统一的接入答案：a8．thebranchesbetweennodesa.节点间的支路b.中间交换节点c.全双工的连接答案：a9．treetopologya.双绞线b.结构部件c.树状拓扑答案：c10．backbonehierarchicalnetworka.国家网络b.被分离开的子网c.主干体系网络答案：c11．thesubscriberthattransmitdigitalsignala.发送数字信号的用户b.一小部分用户c.相邻的端局答案：a12．multiplevoice-frequencycircuitsa.高效中继线b.多音频电路c.同步时分复用答案：b13．thefunctionofconcentratingtraffica.集中话务量的功能b.路由选择的基本次序c.发送数字信号的用户答案：a14．fullduplexa.全双工的连接b.全连通性c.全双工的答案：c15．transmissionfacilitiesa.传输设备b.交换区c.高效中继线答案：a16．switchingtechniquea.交换技术b.电路交换c.分组交换答案：a17．messageswitchinga.交换技术b.报文交换c.分组交换答案：b18．communicationpartiesa.传输单元b.通信各方c.返回信号答案：b19．thespecialsignalingmessagea.存储转发传输技术b.带宽的动态分配c.特定的信令信息答案：c20．lowchannelutilizationa.低的电路利用率b.报文整个的传输时延c.传输单元答案：a21．totalpathofconnectedlinesa.连线的整个通路b.源到目的地的一对c.带宽的动态分配答案：a22．radiocabineta.无线通信行业b.无线机架c.多径衰耗答案：b23．telephonecompanyzoneofficesa.移动收发信机b.电话公司地方局c.中央协调单元答案：b24．availableradiofrequencyspectruma.所分配的频带b.调频广播业务c.可用的无线电频谱答案：c25．centralcoordinatingelementa.中央协调单元b.试验性的蜂窝系统c.有限的服务能力答案：a26．severespectrumlimitationsa.严厉的频谱限制b.有限的服务能力c.有限的指定频带答案：a27．developmentalcellularsystema.频谱利