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| unit ground loop | |||
| 单元 环: 21 phrases in 11 subjects |
| Automatic control | 1 |
| Chemistry | 1 |
| Computer networks | 1 |
| Earth sciences | 3 |
| Electronics | 6 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Information technology | 1 |
| Mechanics | 1 |
| Nautical | 1 |
| Oil / petroleum | 3 |
| Technology | 2 |
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