Circuit-switchingtechnolog（2014年上半年系统集成项目管理工程师上午综合知识真题解析）
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
参考答案： A
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