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位标器 : 48 phrases in 12 subjects |
| Air defense | 1 |
| Aviation | 10 |
| Cryptography | 1 |
| Earth sciences | 1 |
| Electronics | 6 |
| General | 1 |
| Geophysics | 1 |
| Metallurgy | 4 |
| Navigation | 1 |
| Oil / petroleum | 1 |
| Space | 11 |
| Technology | 10 |
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