TCVN 5132-1990 Instructions for formulating and submitting the report of resources of petroleum and gas deposits《石油与气藏资源报告的制定和提交说明》.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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