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countersign | |||
check-back signal | |||
acknowledgement signal; answer signal | |||
reply signal | |||
answering signal; response message | |||
answerback |
应答信号 : 20 phrases in 8 subjects |
Electronics | 5 |
Geophysics | 2 |
Information technology | 1 |
Military | 1 |
Shipbuilding | 1 |
Space | 2 |
Technology | 4 |
Telecommunications | 4 |