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| 煤炭技术 (为制造气体和液体燃料，处理煤的过程。) | |||
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coal technology : 14 phrases in 6 subjects |
| Agriculture | 1 |
| China | 2 |
| Ecology | 1 |
| Environment | 2 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Metallurgy | 5 |
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