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| 冲头接头: 20 phrases in 9 subjects |
| Aviation | 1 |
| Drilling | 4 |
| Earth sciences | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Mechanic engineering | 1 |
| Oil / petroleum | 3 |
| Shipbuilding | 2 |
| Technology | 6 |
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