SIS SS-ISO 2814-1990 Paints and varnishes Comparison of con- trast ratio (hiding power) of paints of the same type and colour《油漆和清漆 同一类型和颜色油漆反差率（遮盖力）的比较》.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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