Sample without commercial value, only for the Purpose of Custom declaration.
样品无商业价值，仅供报关使用。英语怎么表达？
Analysis of Factors of Commercial Coal Sampling Effected on Coal Sample Representation
商品煤样采制过程中影响煤样代表性的因素分析
Analysis on Errors and Adjustment of Sampling Frame in Commercial Statistic Sample Survey
浅析商业抽样调查中抽样框偏误及调整
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