JUS C A4 030-1986 Mechanical testing of metals Hardness test Vickers test (HV 5 to HV 100)《金属的机械测试 维氏硬度试验（维氏硬度5-100）》.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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