NEN 3116-1990 Construction drawings - Basic symbols for the interchange of data about the position of underground cables and pipelines《建筑制图 地下电缆和管道的位置的数据交换用基本符号》.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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