Some firms have adopted “differential pricing” schemes that use formulas, based on average income per head, to set lower prices in poor countries.
一些公司已经在采用依据人均收入区别定价的方法向贫穷国家提供价格较低的药品。
It is shown that the differential conductance, average current and shot noise power are suppressed by the impurities and rough interface scattering.
研究表明，无序层中的杂质散射和粗糙界面散射都能抑制系统的微分电导、平均电流和散粒噪声功率。
The experiment shows that the stability of average background method is stronger than frame differential method.
实验表明，平均背景法的稳定性要优于帧间差分法。
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