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| пологопадающий пласт (угол падения 1-5ш, иногда до 15ш); слабонаклонный пласт (угол падения 1-5ш, иногда до 15ш) | |||
| горизонтальный пласт | |||
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level seam : 4 phrases in 1 subject |
| Gas processing plants | 4 |
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