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| drilling slot; well slot | |||
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井槽 : 25 phrases in 8 subjects |
| Bridge construction | 1 |
| Drilling | 3 |
| Engineering geology | 1 |
| Geophysics | 2 |
| Mechanics | 1 |
| Nautical | 3 |
| Oil / petroleum | 6 |
| Technology | 8 |
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