SANS 4047-1977 Leather - Determination of sulphated total ash and sulphated water-insoluble ash《皮革 硫酸化总灰分和硫酸化不溶于水灰分的测定》.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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