NF T60-166-1994 Temporary protection against corrosion Method of prepare metallic probes for the evaluation of the properties of preservative products 《临时防蚀产品 防腐产品性能评价用金属探测器的制备方法》.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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