... 拨号交换机 dial exchage; dial exchange 长话交换机 toll telephone switching system 程控交换机 programmed controlled exchange; spc exchange ...
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长途电话自动交换机 automatic toll switching system
长途电话交换机 long distance telephone exchange ; toll telephone switching system
全自动长途电话交换机 [通信] automatic toll switching system
共电制长途电话交换机 common battery toll switchboard
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