This paper discusses the operating characteristics of palladium catalyst and the purity standard and measuring etc. problems of hydrogen after the usage of palladium catalyst.

本文讨论把触媒的使用特性及使用后氢气纯度的标准、计量等问题。

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The powders were tested by chemical composition analysis and construction analysis. The size of the powder, the purity and the specific area were all better than those of standard.

通过正交实验得出最佳反应条件，制得的超细氧化锌粉料经组分分析、结构分析表明，其粒径、纯度、比表面积和晶型均符合相关标准。

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The crystal shape, whiteness, purity of products are up to quality standard.

产品的晶型、白度和纯度等达到质量标准。

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This promise can be verified every minute of the day by observing the current rate of exchange between the dollar and gold, and, under a classical gold standard, by exchanging currency at a national bank for gold coins of a fixed weight and purity.

FORBES: The Dollar, Gold And The Quality Of Money