The fire fighting team has to feed back to the telephone operator within 5 minutes if a fire brigade should be dispatched.
如果需要拨打火警电话，消防队员应该在5分钟内给接线员回电话。
The testing instrument of telephone outside connections is a set of instruments for examining and testing telephones and feed lines by telephone exchange station opera-tors.
电话外线测试仪，是电话交换台对用户话机、馈线进行检查、测试的配套仪器。
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