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字形 钻头 : 39 phrases in 9 subjects |
| Architecture | 1 |
| Bridge construction | 1 |
| Drilling | 3 |
| Engineering geology | 7 |
| Explosives and Explosive Ordnance Disposal | 2 |
| General | 2 |
| Geology | 1 |
| Oil / petroleum | 5 |
| Technology | 17 |
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