NF P98-311-1994 Gully tops and manhole tops for vehicular and pedestrian areas Design requirements type testing marking quality control 《机动车辆和行人通过区域的水沟盖顶和人孔盖顶的设计要求 试验类型、标志和质量控制》.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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