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测 定 密度 : 31 phrases in 10 subjects |
| Chemistry | 3 |
| Drilling | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 9 |
| Medical | 2 |
| Oil / petroleum | 1 |
| Oil and gas | 2 |
| Oil processing plants | 3 |
| Technology | 7 |
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