电位器和�动变阻器都是变阻器它们的原理都是通过改变导体的长度从而改变接入电路中的电阻．如图是某电位器的结构示意图电阻片r的两端分别与接线端 Sketch Coloring Page

电位器和�动变阻器都是变阻器它们的原理都是通过改变导体的长度从而改变接入电路中的电阻．如图是某电位器的结构示意图电阻片r的两端分别与接线端 Template

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tomski电位器和�动变阻器都是变阻器它们的原理都是通过改变导体的长度从而改变接入电路中的电阻．如图是某电位器的结构示意图电阻片r的两端分别与接线端 coloring

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