“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	underlying net underlying object underlying polyhedron underlying set underlying-set functor underlying simple graph underlying space underlying topological space underlying topology underlying variety undermassive star undermoderated under-moon Under nutrition Under One Roof underpants underpass underpass bridge underpinning underpotential deposition underpotential deposition (UPD) underpressure underquenching under-relaxation underrelaxation

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