次烟煤 meaning in Chinese
su ituminous
subbituminous coal
subbituminous
Examples
- Theastm rankings for bituminous coal , sub - bituminous coal , or lignite fit the spreader combustion process well
美中试验材料协会根据煤在燃烧时的性能把煤分为烟煤，次烟煤，褐煤几个等级。
su ituminous
subbituminous coal
subbituminous