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采用新的数学模型研究二元颗粒混合物的取样误差，首次提出了取样的逻辑质量单元的理论，探讨了逻辑质量单元的物理意义，建立了按质量取样的标准偏差的计算公式．应用颗粒药品二元混合物的取样实验，证实了该公式的正确性
A new mathematical model was used to study the sampling error of binary mixture. The theory of sampled logical quality unit was first proposed. The physical meaning of logical quality unit was discussed. The formula of standard deviation of sampling by quality was established. The sampling experiments of binary mixtures of granular drugs confirmed the correctness of the formula