Anyị bụ nnukwu ụlọ ọrụ na-emechi ihe na ọkụ anaghị ejikọta nyocha, mmepe, mmepụta na ahịa.Ngwaahịa anyị gụnyere: akwa mkpuchi ọkụ, usoro gasket, usoro asbestos, usoro nkwakọ ngwaahịa, ngwaahịa seramiiki, wdg. A na-eji ngwaahịa anyị eme ihe n'ọtụtụ ebe n'ọhịa nke ihe owuwu, ...
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