单选题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.Aconnection orientedBconnectionlessChigh bandwidth utilizationDpoor real-time
单选题
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.
A
connection oriented
B
connectionless
C
high bandwidth utilization
D
poor real-time
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