NEN 2535-1986 Fire detection installations System- and quality requirements and guidelines for detector siting《火灾探测装置 探测器安装的系统和质量要求和导则》.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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