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压入头 : 23 phrases in 9 subjects |
| Drilling | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Mechanics | 4 |
| Metallurgy | 1 |
| Nautical | 1 |
| Oil / petroleum | 6 |
| Technology | 7 |
| Thermal engineering | 1 |
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