搜索 - 科创

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在网上买一个这样的电源原来是3相四线但是黑线很细大概0.5平方mm的线，220V的接法就是黑线加其中一根相线为一组另外两根相线为一组通电后能显示，但不工作，交流接触器也不工作，内部四个指示灯有两个亮了...

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