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  • C.蒸汽开关与发热盘底部的双金属片开关总是同时断开

       2026-10-05 网络整理佚名990
    Key Point:[题目]阅读短文.回答问题 电水壶电水壶如图甲所示.它的工作原理是:接通电源.水温上升到100℃开始沸腾.水蒸气使双金属片变形推动蒸汽开关
     
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