ONORM S 5407-1990 Measuring and working conditions for the determination ofsound power of machines for building constructions Single blade circular saw benches《建筑机械声功率测定的测量和工作条件 单刀.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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