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IEC 60027为国际电工委员会的电气技术用字母符号标准。分为以下几个部分：
- IEC 60027-1: General 总则
- IEC 60027-2: Telecommunications and electronics 电信和电子学
- IEC 60027-3: Logarithmic and related quantities, and their units 对数量和单位
- IEC 60027-4: Symbols for quantities to be used for rotating electrical machines 旋转电机用量值符号
- IEC 60027-6: Control technology 控制技术
- IEC 60027-7: Physiological quantities and units
1999年新增的IEC 60027-2[1]定义了kilobit不可代表kibibit。
统一的ISO/IEC IEC 80000-13:2008标准取消并取代第3.8和3.9的IEC 60027-2:2005（二进制前缀倍数），唯一的改变是增加了明确的定义和一些数量。[2]
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