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| 区识别 | |||
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zone identification : 24 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 7 |
| Electronics | 4 |
| General | 2 |
| Metallurgy | 1 |
| Military | 1 |
| Nautical | 2 |
| Space | 4 |
| Technology | 2 |
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