Circuit—switching technology is used in Publish Switched Telephone Network(PSTN),Global System for Mobile Communications(GSM)and

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问题 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.

选项 A、connection oriented
B、connectionless
C、high bandwidth utilization
D、poor real—time

答案D

解析
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