SIS SS 18 60 19-1980 Anti-rust agents for vehicles Fluids for hollow sections Determination of rust-preventive capacity《车辆防锈剂 空心型钢流体 防尘性能测定》.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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