“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	major-minor system major missile attack major musical academic societies in foreign countries major order major orders Major Passages of the Peking Opera Play “Women Generals of the Yang Family” major planet major premise major radius of orbit major railway accident major renal calix major revolution and major historical dramas major risk source management system major salivary gland major salivary glands major sector major segment of a circle major star major subject major subset major term major thenar major town major transverse crease major triangle center

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