NC 90-04-09-1984 Metrological Assurance One Mark and Two Marks Flasks for General Use Verification Methods and Means《计量保证的一个标记和两个标记的长颈瓶的一般使用用法 验证方法和手段》.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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