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| determination of azimuth | |||
| azimuth determination | |||
| azimuthal determination; azimuth observation | |||
| 方位角 测 定: 4 phrases in 4 subjects |
| Air defense | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 1 |
| Telecommunications | 1 |
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