The type of coal - forming is humic coal, vitrinite is a main variations of coal maceral.煤的成因类型以腐植煤为主, 镜质组为主要的显微煤岩组分.There are relationships between absorption and proximate analyses, maceral analyses and ultimate analys...

maceral的音标：maceral的英式发音音标为：['mæsəræl]maceral的美式发音音标为：['mæsəræl]...

n.煤中矿物组分的细微组织，煤素质...