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| 无庄脚自重固定钻井平台; 重力平台 | |||
| 重力式结构 | |||
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gravity structure : 21 phrases in 7 subjects |
| Bridge construction | 1 |
| Desert science | 1 |
| Earth sciences | 1 |
| Navigation | 4 |
| Oil / petroleum | 4 |
| Rail transport | 2 |
| Technology | 8 |
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