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| 极劣焦炭 | |||
| 劣质焦炭 | |||
| 劣焦煤; 极劣焦煤; 天然焦 | |||
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cinder coal : 4 phrases in 3 subjects |
| Ecology | 1 |
| Hydroelectric power stations | 1 |
| Technology | 2 |
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