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| наклонный пласт | |||
| крутопадающий пласт | |||
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| смоляная прослойка | |||
| pitching seam: 9 phrases in 5 subjects |
| Geology | 2 |
| Mining | 3 |
| Oil / petroleum | 1 |
| Technology | 1 |
| Wood processing | 2 |
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