SANS 1697-2007 Verification standards for the verification of mass-measuring instruments including commercial standard masspieces《质量测量仪器质量检验的检验标准，含商业标准是，质量块》.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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