Editorial Note: This article is written with editorial review and topic relevance in mind.
英文名称：direct acting indicating analogue electrical measuring instruments and theiraccessories. Geogebra 提供了一个免费在线科学计算器, 可以执行包含分数, 统计学, 指数函数, 对数, 三角学等多种运算! Part 1:definitions and general requirements common to all parts.
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