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| 双层岩心管 | |||
| 双管钻具 | |||
| 复式岩心管; 双重岩心管 | |||
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| 双层岩心筒 | |||
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двойная колонковая труба : 5 phrases in 3 subjects |
| General | 1 |
| Mining | 2 |
| Oil / petroleum | 2 |
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