The method of decision-making in the category on the basis of only one or several neighbouring samples to determine the type of sub-sample was taken to be the category.

该方法在定类决策上只依据最邻近的一个或者几个样本的类别来决定待分样本所属的类别。

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The sample preparation by the filter paper method and the direct determination of major (thulium)and five neighbouring micro-rare earth element impurities in pure thulium oxide by XRF are described.

本文拟定了一种采用滤纸片法制样，X射线荧光直接测定纯氧化铥中氧化铥主量以及氧化钬、氧化铒、氧化镱、氧化镥和氧化钇等稀土杂质含量的分析方法。

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