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Circuit-switching technology is used in Public Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and Code Division Multiple Access(CDM A). It is a ( ) information transfer mode.

单选题
Circuit-switching technology is used in Public Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and Code Division Multiple Access(CDM
A). It is a ( ) information transfer mode.

AConnection oriented

Bconnectionless

CHigh bandwidth utilization

DPoor-real-time

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