ONORM M 7858-1991 Thermal cutting - Laser beam cutting of metallic materials - Principles ofprocesses quality dimensional tolerances《热切割 金属材料的激光束切割 工艺原则，质量，尺寸公差》.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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