SIS SS 2677-1992 Indexable hardmetal (carbide) inserts with rounded corners and partly cylindrical fixing hole V-shaped inserts《可转位硬金属（碳化物）圆形刀片 部分有圆柱形固定孔 V形刀片》.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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