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提出了渐进取样法，通过样本数目的累积，使总方差估计值达到所需的精度。应用MonteCarlo模拟技术考察了满足一定取样精度的样本数目及其偏差。将该方法应用于散装生铁块中Si、Mn、C、S、P含量分析的取样，结果令人满意。该项研究对于大宗货物的实际随机取样具有重要参考价值。
A progressive sampling method is proposed. Through the accumulation of the number of samples, the total variance estimation reaches the required accuracy. The MonteCarlo simulation technique is used to investigate the number of samples and their deviations which meet certain sampling precision. The method was applied to the sampling of Si, Mn, C, S, P contents in bulk pig iron with satisfactory results. This study has important reference value for the actual random sampling of bulk cargoes.