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%D8%A7%D9%84%D8%AD%D9%84%D9%82%D8%A9 %D8%A7%D9%84%D8%AB%D8%A7%D9%86%D9%8A%D8%A9 %D9%88%D8%A7%D9%84%D8%B9%D8%B4%D8%B1%D9%88%D9%86 CT magnetization curve test amp loop resistance