CSN 25 4113-1954 Thread gauges Not-go-side screw plug gauges diameter over 30 up to 100 mm Metric thread《螺纹滚轴内径 30至100毫米 公制螺纹》.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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