 |
| |||
| frequency surface | |||
| 频率 面: 17 phrases in 12 subjects |
| Advertising | 1 |
| Air defense | 2 |
| Aviation | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Nautical | 1 |
| Space | 2 |
| Statistics | 2 |
| Technology | 3 |
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