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| стойкость бура | |||
| срок службы бурового оборудования; срок службы коронки; стойкость бура (количество погонных метров, пробуриваемых им до износа) | |||
| drilling life: 5 phrases in 2 subjects |
| Oil / petroleum | 3 |
| Oil and gas | 2 |
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