1. Gabatarwa zuwa Carbon Karfe Bututu Karfe Karfe, saje na baƙin ƙarfe da carbon, shi ne ainihin abu a cikin masana'antu saituna.An zaɓi shi don ma'auni na dorewa, rashin ƙarfi, da ingancin farashi.A cikin nau'in bututu, musamman bambancin 8-inch, ya zama kashin baya a cikin tsarin ...
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