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理学
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体系加入已知量待测物质的测定值和测得体系原有待测物质含量的差值与此加入量的百分比。反映待测物在样品分析过程中损失程度的指标，损失越少，回收率越高，与真实成分和分析的准确度有密切的关系。在无标准物质和标准方法对照的情况下，是最常用来检验相对系统误差和估计测定准确度的方法。
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Freshwater Fisheries Research Center
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