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試卷年份2014年上半年
試題題型【單選題】
試題內(nèi)容

Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.
A. connection oriented            
B. connectionless
C. high bandwidth utilization          
D.poor real-time

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