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| 煤田; 煤矿床 | |||
| 煤藏 | |||
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| 煤炭沉积 | |||
| 煤田; 煤矿床; 煤沉积; 煤层 | |||
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coal deposits : 11 phrases in 5 subjects |
| Earth sciences | 1 |
| Economy | 1 |
| Electronics | 2 |
| Oil / petroleum | 1 |
| Technology | 6 |
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