Zowonongeka zamoto-kuviika kanasonkhezereka: kuzimitsa, zikande, zolengeza passivation, miyala zinki, mbali wandiweyani, zizindikiro za mpeni mpweya, mpweya mpeni zipsera, chitsulo choonekera, inclusions, kuwonongeka makina, ntchito zoipa gawo lapansi zitsulo, mafunde m'mphepete, buckling. , substandard size, embossing, zinki wosanjikiza wokhuthala ...
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