composition B[化] B炸药(如中国的黑梯炸药)compositionn.成分；作品；组织；作文；合成物Composition of public expenditure财政支出结构composition of export commodities出口产品结构Composition irrelevant to subject文不对题compositional refinement checking组合精化检验Composition of Combustion Product排气成分composition of brightness capital智慧资本构成compositions of fashionable prose时文章法composition of fiscal expenditure财政支出结构Composition cork - Test methods复合软木。试验方法composition of primary cosmic ray一次宇宙线的组成