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| 矿地下巷道 | |||
| 地下开采 | |||
| 巷; 巷道; 平巷; 地下坑道; 井下开采巷道 | |||
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| 井下巷道; 矿内巷道 | |||
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подземная выработка : 5 phrases in 3 subjects |
| General | 2 |
| Oil / petroleum | 1 |
| Oilfields | 2 |
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