The necessity of expanded coal rank for CWM production and saving coking coal resources were dis - cussed in this paper.

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。

youdao

The necessity of expanded coal rank for CWM production and saving coking coal resources were dis - cussed in this paper.

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。

youdao