SIS SMS 1495-1950 《仪器，螺纹公差最小，参考最小和最大，普通标准内直径18-180》.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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