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ISO TR 23304 2021 Food products — Guidance on how to express vitamins and their vitamers content.pdf
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ISO 6388 1989 Surface active agents — Determination of flow properties using a rotational viscometer.pdf
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ISO IEC 17982 2021 Information technology — Telecommunications and information exchange between systems — Close capacitive coupling communication physical layer (CCCC PHY).pdf
GB-T 23893-2009 滑动轴承用热塑性聚合物 分类和标记.pdf
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GB-T 22427.13-2008 淀粉及其衍生物二氧化硫含量的测定.pdf
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GB-T 17607-1998 中国煤层煤分类.pdf
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