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| big aperture well | |||
| open well | |||
| dug well; large open well; wide-bore well | |||
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| sweep well | |||
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| open well | |||
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大口井 : 12 phrases in 6 subjects |
| Drilling | 2 |
| Engineering geology | 2 |
| Geophysics | 1 |
| Mining | 1 |
| Oil / petroleum | 5 |
| Technology | 1 |
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