TCVN 7447-7-717-2011 Electrical installations of building Part 7-717 Requirements for special installations or locations Mobile or transportable units《建筑物电气装置 第7-717部分 特殊装置或场所的要求 移.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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