IEC 60027-6 letter symbols control technology
电工技术中使用的字母符号 – 第6部分:控制技术
Letter symbols to be used in electrical technology – Part 6: Control technology
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Letter symbols to be used in electrical technology – Part 6: Control technology
Letter symbols to be used in electrical technology – Part 4: Rotating electric machines
Letter symbols to be used in electrical technology – Part 3: Logarithmic and related quantities, and their units