NF P34-302-1994 Roofing products from metal sheet Specification for fully supported roofing products of zinc sheet 《金属板屋面制品 锌板制全支撑屋面制品的标准规范》.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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