NF P90-106-1992 Sports grounds Measurement of the skidding conditions of a surface with a friction pendulum 《运动场 用磨擦摆测量表面滑行条件》.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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