IEC 60051-5-2017 直接作用模拟指示电测量仪表及其附件--第5部分:相位表、功率因数表和同步指示器的特殊要求 Direct acting indicating analogue electrical measuring instruments and their accessories – Part 5: Special requirements for phase meters, power factor meters and synchroscopes IEC 60051-5-2017 直接作用模拟指示电测量仪表及其附件--第5部分:相位表、功率因数表和同步指示器的特殊要求 Direct acting indicating analogue electrical measuring instruments and their accessories – Part 5: Special requirements for phase meters, power factor meters and synchroscopes

IEC 60051-5-2017 直接作用模拟指示电测量仪表及其附件--第5部分:相位表、功率因数表和同步指示器的特殊要求 Direct acting indicating analogue electrical measuring instruments and their accessories – Part 5: Special requirements for phase meters, power factor meters and synchroscopes

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