1.General gabatarwar free-yanke karfe Free yankan karfe, kuma yana nufin a matsayin free-machining karfe, shi ne gami karfe ta Bugu da kari na daya ko fiye free yankan abubuwa kamar su sulfur, phosphorus, gubar, calcium, selenium da tellurium zuwa. inganta yankan dukiya.Free yankan karfe i...
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