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选煤成本在煤炭生产和销售的总成本中，所占比例虽小但很重要。要使煤炭质量符合客户的严格要求，就应继续进行降低成本的研究和开发。煤炭生产商也应了解煤炭利用技术方面的新发展，这种发展通常是由于经济增长和环境要求而取得的，这样就可以提供满足用户要求的煤炭。1干法选
The cost of coal preparation is a small but important part of the total cost of coal production and sales. To make the quality of coal meet the strict requirements of customers, we should continue to reduce the cost of research and development. Coal producers should also be aware of new developments in coal utilization technologies that are often derived from economic growth and environmental requirements to provide coal that meets user requirements. A dry election