A wasu masana'antun sarrafa karafa masu nauyi, kamar masana'antar kera jiragen ruwa, injinan hakar ma'adinai, da injinan gine-gine, galibi ana fuskantar irin wadannan matsalolin: ta yaya za a samu tsayayyen walda na karfe da sassan karfe?Yawancin lokaci, sassan ƙarfe za su nuna saman da aka yanke bayan yankan gabaɗaya ...
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