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GB/T 23938-2021 High purity carbon dioxide 高纯二氧化碳 - 中英文版 |
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GB/T 12690.1-2015 Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides—Part 1: Determination of carbon and sulfur contents—High frequency-infrared absorption method 稀土金属及其氧化物中非稀土杂质化学分析方法 第1部分：碳、硫量的测定 高频-红外吸收法 - 中英文版 |
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GB/T 23938-2009 High purity carbon dioxide 高纯二氧化碳 - 中英文版 |
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