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容量为5.0L的某品牌电热水壶如图甲所示,简化电路图如图乙所示,S是保温和加热的自动转换开关.其加热功率为2kW,在1个标准大气压下,让该壶正常工作,将一满壶初温为20℃的水烧开用了15min.求:...
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