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Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global S

题目

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
正确答案:D