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| well sinking; well drilling | |||
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下井 管 : 72 phrases in 12 subjects |
| Construction | 1 |
| Drilling | 23 |
| Earth sciences | 3 |
| Electronics | 1 |
| Engineering geology | 3 |
| General | 1 |
| Geophysics | 1 |
| Life sciences | 1 |
| Mechanics | 2 |
| Navigation | 2 |
| Oil / petroleum | 25 |
| Technology | 9 |
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