In a ()switching system, a call was established and routed in a set of progressive electromechnical steps, each under the direct control of the user ’ s dialing pulse. A.step-by-step B.crossbar C.stored-program-control D.manual

In a ()switching system, a call was established and routed in a set of progressive electromechnical steps, each under the direct control of the user ’ s dialing pulse.
A.step-by-step
B.crossbar
C.stored-program-control
D.manual

出自：河南师范大学-计算机科学与技术-专业英语

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