A case study has shown that the established mathematical model is practicable.
并以实例，验证该模型的实用性。
Established mathematical model of evaluating free sand, erosion sand and sand skeleton output critical condition;
建立了评价游离砂、剥蚀砂和骨架砂产出临界条件的数学模型；
Method:The uncertainty was evaluated by a established mathematical model and the analysis of various factors affecting sample detection.
方法：建立数学模型，对含量测定过程中各影响因素进行分析评估。
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