NF P82-204-1957 Lifts and service lifts Rules for the design of the metal frame work bearing either the hoist or the guide pulleys 《载客电梯和货梯 传动机构带滑轮或铰盘的金属构架计算规则》.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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