multiplicatively closed set
... 积变换：product transformation 积闭集：multiplicatively closed set 积保存函子：product preserving functor ...
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传统的UPS旧障诊续的方式非依据己类积集的经验和数据，闭于拆备的旧障及其收铺变更入行诊续和估量。
Traditional UPS Fault Diagnosis methods to diagnose and calculate the Diagnosis of equipments based on the accumulative experience and data.
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