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| 岩心出筒顶心杆; 顶心塞 | |||
| 岩心推取杆 | |||
| 液压或螺旋的岩芯推出器; 退心接头 | |||
| core plunger: 2 phrases in 2 subjects |
| Metallurgy | 1 |
| Technology | 1 |
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