NEN-ISO 5136-1994 Acoustics Determination of sound power radiated into a duct by fans In-duct method (ISO 5136 1990+A1 1993)《ISO 5136-1990+A1-1993 声学 风机辐射入管道中的声功率的测定 管道法》.pdf

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NEN 3769-1981 Cheese - Physical and chemical test methods - Enzymatic determination of the lactose content《干酪 物理和化学试验方法 乳糖含量的酶测定》.pdf

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NEN 3775-1979 Cheese - Physical and chemical test methods - Determination of the pH《干酪 物理和化学试验方法 pH值的测定》.pdf

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NEN 3782-1982 Quarg (freeh ctieese) - Preparation of the sample for physical and Chemical examination《粗制酸干酪（鲜干酪） 物理和化学检验用样品的制备》.pdf

NEN 3783-1992 Quarg (fresh cheese) - Separation of fatty constituents from a sample《粗制酸干酪（鲜干酪） 样品中脂肪成分的分离》.pdf

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