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分辨 角 : 63 phrases in 11 subjects |
| Air defense | 2 |
| Drilling | 2 |
| Earth sciences | 4 |
| Electronics | 2 |
| Geology | 1 |
| Geophysics | 12 |
| Information technology | 2 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Space | 8 |
| Technology | 26 |
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