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电线正负极颜色是怎样的_家居日记
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电线正负极颜色是怎样的

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电线正负极颜色是怎样的 电线正极是红色，负极是黑色。若是从表面标注的符号进行区分，那么带有“+”号的属于正极，而带有“-”号的属于负极。而无法看出标注符号的，则


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