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| 天然井 | |||
| 自然产油井 (无增产措施) | |||
| 自然产油井; 天然水井 | |||
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natural well : 9 phrases in 3 subjects |
| Engineering geology | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 5 |
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