Rare ƙasa karafa ne da muhimmanci albarkatun kasa don samar da hydrogen ajiya kayan, NdFeB m maganadisu kayan, magnetostrictive kayan, da dai sauransu An kuma yi amfani da ko'ina a cikin wadanda ba ferrous karafa da karfe masana'antu. Amma aikin ƙarfensa yana da ƙarfi sosai, kuma yana da wahala a cire i...
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