SIS SS-ISO 7441-1989 Corrosion of metals and alloys Determination of bimetallic corrosion in outdoor exposure corrosion tests《金属和合金的腐蚀 户外暴露腐蚀检测中对双金属腐蚀情况的判定》.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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