1.如图4所示在条形磁铁的中央位置的正上方水平固定一铜质圆环.以下判断中正确的是 A.释放圆环环下落时环的机械能守恒 b.释放圆环 Template




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tomski1.如图4所示在条形磁铁的中央位置的正上方水平固定一铜质圆环.以下判断中正确的是 a.释放圆环环下落时环的机械能守恒 b.释放圆环 coloring