SIS SS 2824-1979 Fittings for piping Shut-off valves for PN 16 Straight globe valves of gunmetal with flanged ends rising stem and metallic disk washer《管道配件 PN16截流阀 有法兰端的铜锡合金合金直通.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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