CSN 42 0319-1982 Metal testing Test pieces of rectangular cross-section thickness 4 up to 50 mm and including for tensile testing of metals《金属拉伸试验用的试件的矩形截面厚度为4到50毫米（包括50毫米在内）》.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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