SNI 05-2270-1991 Synchronous belts Calculation of power rating and drive centre distance《同步带 电源率与驱动中心距离计算》.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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