NEN-ISO 8846-1993 Small craft Electrical devices Protection against ignition of surrounding flammable gases (ISO 8846 1990)《ISO 8846-1990 小艇 电气装置 周围可燃性气体防燃防护》.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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