NF S31-150-1990 Acoustics Measurement of noise emitted by two-wheeled mopeds in motion Engineering method 《声学 机动脚踏两用车噪音的测定 工程法》.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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