试题内容
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
软题库参考答案：A（仅供参考）
软题库解析：正在加载....
