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| 双动双层岩芯管 | |||
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| 双动双层取心筒 | |||
| 双动双层岩芯管; 双动双层取芯器 | |||
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double-tube rigid-type core barrel : 8 phrases in 3 subjects |
| Drilling | 2 |
| Engineering geology | 3 |
| Technology | 3 |
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