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| aids to navigation; navigational aid | |||
| navigation support equipment | |||
| aid to navigation; navigation aids; navigational aids | |||
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导航辅助设备 : 18 phrases in 7 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Electronics | 5 |
| Navigation | 1 |
| Shipbuilding | 2 |
| Space | 5 |
| Technology | 2 |
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