SIS SS 3637-1990 Plastics pipes Pressure pipes of PEM for transport of hot water Requirements and testing《塑料管 输送热水的PEM压力管 要求和测试》.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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