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| underground condition | |||
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| underground conditions | |||
| underground conditions (при выборе места заложения шахтного ствола) | |||
| downhole conditions | |||
| underground condition | |||
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подземное условие : 9 phrases in 3 subjects |
| Gas processing plants | 3 |
| General | 1 |
| Mining | 5 |
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