TCVN 4717-1989 Occupational safety standards system Industrial equipment safety protectors General safety requirements《职业安全标准体系 工业设备安全保护装置 一般安全要求》.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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