HD 568 S1-1990 Methods of Test for the Determination of the Insulation Resistance of Solid Insulating Materials《测试方法对固体绝缘材料绝缘电阻的测定》.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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