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明线载波通信新型303一A明线高 12路载波电话设备…………………………81一1明线载波电路串杂音指标的维护与分析……………·,…………·sl一3防止架空通信明线条、隔电子遭受雷击障碍问题的探讨………81—2 农 村 通 信15路脉冲编码调制农村通信设备………………………………
The new line carrier communication 303 a A line 12 high-carrier telephone equipment .............................. 81 a line carrier circuit noise indicators of the maintenance and analysis ............... · ......... · sl A 3 to prevent overhead communication Ming lines, separated by lightning strike obstacles encountered 81 ... ... 81-2 rural communications pulse encoding modulation rural communications equipment .................................