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覆盖 压力 : 16 phrases in 8 subjects |
| Aviation | 1 |
| Bridge construction | 2 |
| Earth sciences | 1 |
| Electronics | 2 |
| Engineering geology | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Oil / petroleum | 1 |
| Technology | 6 |
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