CSN 28 0312-1976 Rolling stock gauges for railway gauge 1435 and 1520 mm technical rules《1435 及1520 mm 规格铁路的全部车辆规格》.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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