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| direction finding | |||
| 方向定位: 24 phrases in 12 subjects |
| Air defense | 3 |
| Aviation | 2 |
| Cartography | 1 |
| Computer numerical control | 1 |
| Drilling | 1 |
| Earth sciences | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 2 |
| Navigation | 1 |
| Oil / petroleum | 1 |
| Space | 5 |
| Technology | 5 |
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