SIS SS-ISO 2921-1990 Rubber vulcanized Determination of low temperature characteristics Temperature-retraction procedure (TR test)《硫化橡胶 低温特性的测定 温度回缩程序（TR试验）》.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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