1、For example,the signal—————— from a satellite,—————— in fa

1、For example,the signal—————— from a satellite,—————— in far outer space,is very weak
A.received,located B.receive,locate
C.receiving,locating D.to receive,to locate
2.There is a inherent advantage for —————— noisy environments by——————
digital transmission
A.overcoming,choose B.overcome,choosing
C.overcome,choose D.overcoming,choosing
3.An asynchronous serial data link is said—————— character oriented,as information is transmitted in the form of groups of bits —————— characters
A.be,calling B.to being,to call
C.been,call D.to be ,called
4.If a voice circuit has a heavy loss or is nosiy,the speakers compensate automatically by increasing
A.the redundancy of their voice B.the intensity of their voice——————
C.the delay of the speech D.the irregularities of the speech
5.—————— is a networked hypertext protocol and user interface
A.Asynchronous serial interface B.E-mail
C.Internet D.World wind web
6.The researchers —————— produced the first clad glass optical fibers were not thinking of —————— them for communications
A.which,use B.that,used
C.who,using D.one,to use
7.More importantly,however,signal capacity —————— within a synchronous transport frame —————— network transportation capabilities
A.set aside,support B.is set aside,to support
C,is aside,supported D.to set,be supported
8.However,the same optical infrastructure is expected —————— this variety of services
A.to support B.supporting
C.supported D.to be support
9.The operator of a local telephone switchboard had an option —————— an optical or acoustical signal for the —————— person over a wired network
A.transmit,search B.to transmit,searched
C.transmitting,searching D.to transmit,to search
10.One of many reasons for ———— a cellular mobile telephone system and ————
It in many cities is the conventional mobile telephone system
A.develop,deploy B.to develop,to deploy
C.developing,deploying D.developed,deployed