SANS 5860-2006 Concrete tests - Dimensions tolerances and uses of cast test specimens《混凝土试验 铸造测试样品的尺寸，公差和使用》.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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