“methods of sampling”的概念、定义、翻译、参考文献-科学参考

单词	methods of sampling
释义	methods of sampling Encyclopedia 理学【试剂和试样】释 methods of sampling试样准备包括取样和试样制备两步。前者是指从大量物料（分析对象的总体）中取得其中有代表性的一小部分，即在误差允许范围内，这一小部分试样应能代表大量物料的组成。后者是把按一定程序取得的仍然颗粒较大的试样，经过破碎、缩分、研磨、过筛等步骤，制备成适合于作分析用的试样。
随便看	book price book printing book printing in Lin'an book printing in Sichuan book printing in the Jurchen Jin Dynasty book production-sale form book publishing in Sibao book purchase book purchase and selling Book Quality Guarantee System book recommendation book rental industry in ancient China book retail book return rate book review book reviewer book review journal book review science book sales cycle book sales exhibition book sales ranking books and disks books and periodicals design for surface finishing books buying and selling books editing

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