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| 气门头研磨工具插入孔 | |||
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bit hole : 39 phrases in 7 subjects |
| Architecture | 2 |
| Drilling | 5 |
| Engineering geology | 3 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Mechanics | 1 |
| Oil / petroleum | 3 |
| Technology | 23 |
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