ONORM B 4009-1990 Telescopu steel piops specifications for construction load capacity testing marking of conformity《套筒式钢管，建设规范，荷载能力，测试，合格标识》.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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