SIS SS-ISO 5752-1983 Metal valves for use in flanged pipe systems - Face-to-face and centre-to- face dimensions《应用于法兰管系统的金属阀门 面对面尺寸和法兰中心对面尺寸》.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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