 |
| |||
| 最优频率; 最佳频率 | |||
| optimum frequency: 21 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Shipbuilding | 2 |
| Space | 5 |
| Technology | 6 |
| Telecommunications | 1 |
|
| |||
| 最优频率; 最佳频率 | |||
| optimum frequency: 21 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Shipbuilding | 2 |
| Space | 5 |
| Technology | 6 |
| Telecommunications | 1 |