SIS SS-ISO 1167-1982 Plastics pipes for the transport of fluids - Determination of the resistance to internal pressure《用于液体运输的塑料管 对内部压力阻抗的测定》.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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