 |
| |||
| 码信号; 编码信号; 暗号 | |||
|
code signal : 36 phrases in 12 subjects |
| Air defense | 2 |
| Amateur radio service | 2 |
| Communications | 3 |
| Earth sciences | 1 |
| Electronics | 1 |
| Information technology | 2 |
| International trade | 1 |
| Nautical | 4 |
| Space | 2 |
| Sports | 1 |
| Technology | 14 |
| Telecommunications | 3 |