Menene kayan rufewa?1.Insulation abu ne abu da cewa ba ya gudanar da wutar lantarki a karkashin yarda ƙarfin lantarki, amma ba kayan da cewa cikakken ba ya gudanar da wutar lantarki.In wani waje lantarki filin,conductivity, polarization, asara, rushewa da sauran pro ...
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