1. Ihe ndị bụ isi na-emepụta ihe nke eriri akpụkpọ ụkwụ: eriri eriri na-emekarị ihe atọ bụ isi: ihe ndabere, Binder na abrasives.Ihe ndabere: Isi akwa, akwụkwọ mpempe akwụkwọ, ihe mejupụtara.Ihe nkedo: gluu anụmanụ, Semi-resin, Full resin, mmiri na-eguzogide pr ...
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