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1. The necessity of expanded coal rank for CWM production and saving coking coal resources were discussed in this paper.
   摘要阐述了节约炼焦煤资源，扩大制备水煤浆煤种范围的必要性。
2. This article mainly introduces the preparation of petroleum pitch coal additive agent and the slurrying ability of coal on adding petroleum pitch.
   主要介绍了石油沥青水煤浆添加剂的制备和在煤中掺入石油沥青的制浆性能。