NEN 6872-1985 Milk and milk products - Preparation of the sample and preparation of dilutions for microbiological examination《乳及乳制品 样品的制备制备以及用于微生物学检查的稀释液的制备》.pdf

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ITU-R RAPPORT M 766-2 FRENCH-1990 Feasibility of frequency sharing between the GPS and other services《全球定位系统和其他服务之间的频率共享的可行性》.pdf

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