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| 海上钻井隔水管 | |||
| 钻井隔水管 | |||
| 隔水管; 海洋隔水管 | |||
| 海底取油管 | |||
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marine riser : 9 phrases in 3 subjects |
| Navigation | 2 |
| Oil / petroleum | 6 |
| Technology | 1 |
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