NF Q03-035-4-1987 Paper and board Accelerated ageing Part 4 dry heat treatment at 120 or 150 degrees C 《纸和纸板 加速老化 第4部分 120℃和150℃的温度下干热处理》.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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