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Relation: subclass

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CompositeUnitOfMeasure57这是由其他单位的复合函数所决定的 UnitsOfMeasure Class 的实例，当中的每一个可以是一个 CompositeUnitOfMeasure 或是一个 NonCompos...^
    UnitOfFrequency1这个 Class 所有的实例都是可以和 MeasureFn 一起应用来组成 FrequencyMeasure 实例的 UnitOfMeasure。^
        Hertz.这是国际单位制量度频率的单位，符号：Hz。它是每秒週期運動的次 數。 Hertz = s^(-1)。注： Hertz 并没有转换函数。^

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