fractional ppb分数ppbfractionaladj.微不足道的；断片的；分数的；小数的fractional concentration of inspired oxygen吸氧浓度分数, 吸入氧气部分浓度fractional mixed diffusion- wave equation分数阶混合扩散-波动方程fractional Relaxation-Oscillation equation分数阶Relaxation-Oscillation方程Fractional precipitation of ammonium sulphate硫酸铵分级沉淀fractional stimulated Raman adiabatic passage部分受激拉曼绝热通道Fractional-order Gaussian wavelet transform分数高斯小波变换fractional dimension time-location structure分形时-空结构fractionally spaced constant modulus algorithm分数间隔恒模算法Fractional Distillation Systems and Components分馏式蒸馏系统和部件fractional order diffusion-reaction equation扩散-反应方程