NF A35-556-1984 Iron and steel Heat treatable steels for externally threaded fasteners for structural purposes 《钢铁 结构件用的外螺纹紧固件用可热处理钢 》.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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