如图所示连接好电路后将开关s闭合小灯泡不亮.加热电灯泡里的玻璃芯一段时间以后小灯泡亮起.此实验说明导体和绝缘体无明显界线.. 题目和 Template




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tomski如图所示连接好电路后将开关s闭合小灯泡不亮.加热电灯泡里的玻璃芯一段时间以后小灯泡亮起.此实验说明导体和绝缘体无明显界线.. 题目和 coloring