subhydrous maceral低氢煤岩组分
maceral groups显微组分
maceral analyses显微煤岩分析
semigelatinous maceral半凝胶化组分
maceral variety显微组分变种
maceral l煤显微组分
COAL MACERAL煤显微组分
cessory maceral次要显微煤岩组分
group maceral显微组分组
N（名词） any of the organic units that constitute coal: equivalent to any of the mineral constituents of a rock 构成煤块的有机体 [geology]