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| 单动双层岩芯管 (内管不动); 单动双层取芯器 (内管不动) | |||
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| 双层旋转型岩芯管 | |||
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| 单动双层取心筒 | |||
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double tube swivel type core barrel : 10 phrases in 3 subjects |
| Drilling | 2 |
| Engineering geology | 2 |
| Technology | 6 |
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