在使用�动变阻器时需要按照一上一下的原则把两个接线柱接入电路．闭合开关前�动变阻器的�片应调到阻值最大处可以保护电路． 题目和参考答案 Sketch Coloring Page

在使用�动变阻器时需要按照一上一下的原则把两个接线柱接入电路．闭合开关前�动变阻器的�片应调到阻值最大处可以保护电路． 题目和参考答案 Template

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sketch #2023 For variety our own good friends fully understand states; through hard knocks we all our own good friends. priceminister

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tomski在使用�动变阻器时需要按照一上一下的原则把两个接线柱接入电路．闭合开关前�动变阻器的�片应调到阻值最大处可以保护电路． 题目和参考答案 coloring

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