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跟踪角 : 101 phrase in 11 subjects |
| Air defense | 24 |
| Aviation | 8 |
| Earth sciences | 2 |
| Electronics | 10 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Information technology | 1 |
| Nautical | 2 |
| Shipbuilding | 1 |
| Space | 40 |
| Technology | 10 |
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