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| coal technology The processing of coal to make gaseous and liquid fuels (为制造气体和液体燃料，处理煤的过程。) | |||
| colliery engineering | |||
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煤炭 技 术 : 6 phrases in 3 subjects |
| Agriculture | 1 |
| Environment | 2 |
| Explosives and Explosive Ordnance Disposal | 3 |
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