TCVN 7015-1-2002 Machinery for forestry Safety requirements and testing for pole-mounted powered pruners Part 1 Units fitted with an integral combustion engine《林业机械 杆式动力修枝锯的安全要求和试验.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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