NF F01-310-1990 Railway rolling stock Delimitation of technical allowances between the constructors and their suppliers for the execution of an order 《铁路车辆 为执行订货合同制造商及其供货商之间技术公差的确定.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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