在70年代早期，大多数电话交换机还是机电模拟转换器。
In the early 1970s, the majority of telephone exchanges were still electromechanical analog switches.
在电信中心办公室和交换中心安装工机电，模拟和数字集群系统，电路和设备。
Install electromechanical, analog and digital trunking systems, circuits and equipment in telecommunications central offices and switching centres.
简要介绍了柴油机电子调速器配机模拟试验装置的基本工作原理及其系统的设计。
In this paper the fundamental of simulating test device for matching the electric governor with diesel engine and its system design are described.
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