NF T54-027-1980 Plastics Pressure fittings and solvent welded joints of unplasticized PVC Determination of the extractability of lead and tin with watter 《塑料制品 未增塑聚氯乙烯压力配件和溶剂熔接接缝 用.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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