SNI 18-6931-2002 Non-destructive testing radiograpic examination of metallic materials by X-rays and Y-rays - Basic rules《未损检测 X光和Y光金属射线检测 基本规则》.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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