SIS SS-ISO 7668-1988 Anodized aluminium and aluminium alloys Measurement of specular reflectance and specular gloss at angles of 20 45 60 and 85《阳极氧化铝及铝合金20,45,60和85角的镜面反射系数及镜面光泽度.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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