() switching was invented in the late 1960s for data communications.

题库:初级通信工程师 类型:最佳选择题 时间:2020-05-27 14:04:56 免费下载:《2013年初级通信工程师考试上午真题》Word试卷

() switching was invented in the late 1960s for data communications.
A.Frame
B.Link
C.Packet
D.Line

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