| |||
urgent signal | |||
emergency signal | |||
urgency signal | |||
| |||
international urgency signal |
紧急信号: 27 phrases in 11 subjects |
Automobiles | 6 |
Aviation | 1 |
Communications | 1 |
Electronics | 7 |
Information technology | 1 |
Plastics | 1 |
Scuba diving | 1 |
Space | 2 |
Submarines | 1 |
Technology | 5 |
Wind Energy | 1 |