基本解释摩尔分数；克分子分数英汉例句双语例句Examples are given to differentiate quantity ratio and mass fraction, mol ratio and mol fraction, cuba.例析了比率相关量如质量比与质量分数、摩尔比与摩尔分数、体积比与体积分数的区别。词组短语短语mol fraction concentration 摩尔分数浓度专业释义能源科学技术摩尔分数