UNE 58-121-1990 《重型升降机 不同于活动起重机和浮动起重机的升降装置 关于稳定性的一般要求》.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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