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自检的 : 18 phrases in 10 subjects |
| Agriculture | 1 |
| Air defense | 2 |
| Aviation | 4 |
| Computers | 1 |
| Earth sciences | 1 |
| Economy | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Navigation | 1 |
| Space | 4 |
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