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| 近海油气井 | |||
| 海上井 | |||
| 海上油井 | |||
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offshore well : 13 phrases in 6 subjects |
| Bridge construction | 1 |
| China | 1 |
| Economy | 1 |
| International trade | 1 |
| Oil / petroleum | 2 |
| Technology | 7 |
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