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4平方铜线直径多少_家居日记
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4平方铜线直径多少

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4平方铜线直径多少 4平方铜线单根硬线，线芯直径2.24毫米。生活中，实用铜线做导线，导电性很好，大量用于制造电线、电缆、电刷等，导热性好，常用来制造须防磁性干


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