NF G53-001-1970 Rules for flay and trim of raw bovine and equine hides and skins 《皮革 生牛皮（bovine） 和同等皮革的剥皮和修整规则》.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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