Black chitsulo waya ntchito m`kati, chachikulu ndi kudzera otentha zitsulo billet anagubuduza mu sikisi mfundo zisanu mamilimita waya ndodo, ndiyeno kuziyika izo mu kujambula mu mzere wa awiri awiri, mbewu ndiyeno pang`onopang`ono yopapatiza kujambula mbale kabowo, kuzirala. ndi annealing, plating process, monga ...
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