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精确时计 : 14 phrases in 10 subjects |
| Agriculture | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Geophysics | 1 |
| Industry | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 3 |
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