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- 清洁煤炭仍对环境不利。Clean coal isn't climate-friendly yet.
- 无害环境煤炭技术国际圆桌会议;International Round Table on Environmentally Sound Coal Technologies;
- 煤炭技术colliery engineering
- 清洁purity
- 清洁器cleaner
- 清洁的sanitary
- 清洁能源Clean energy
- 煤炭转化技术coal conversion technology
- 清洁用品cleaning supplies
- 煤炭气化技术coal gasification technology
- 清洁生产cleaner production
- 煤炭液化技术coal liquefaction technique
- 不清洁uncleanness
- 煤炭开采技术coal mining technology
- 煤炭多联产技术coal poly - generation technology
- 煤炭洁净转化技术coal cleaning conversion technology
- 清洁化技术cleaner technology
- 煤炭职业技术教育the vocational and technical education of coal industry
- 清洁燃烧技术。* Clean combustion technologies
- 煤炭清洁转化coal clean conversion