NEN 6261-1990 Bacteriological examination of water Examination by means of membrane filtration on the presence and number of colony forming units (CFU) of Escherichia coli《水的细菌检验 膜.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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