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to phrases
line signal
el. 呼叫〔振铃〕信号
IT 线路信号指示灯
mil., air.def. 行信号
tech. 振铃信号
telecom. 线路信号人工交换台的来话呼叫信号
line signal: 63 phrases in 16 subjects
Advertising1
Air defense3
Automobiles1
Badminton1
Communications4
Electronics15
General1
Information technology7
Nautical1
Oil / petroleum2
Project management1
Scuba diving1
Space2
Submarines3
Technology18
Telecommunications2