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1、IEC61857-31®Edition1.02017-01INTERNATIONALSTANDARDElectricalinsulationsystems–Proceduresforthermalevaluation–Part31:Applicationswithadesignedlifeof5000horless)(en017-120:31857-61CEITHISPUBLICATIONISCOPYRIGHTPROTECTEDCopyright©2017IEC,Geneva,SwitzerlandAllrightsreserved.Unlessotherwisespecified
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