Ihe efere PS pụtara bụ efere emebere ya nke ọma na-eji na-ebi akwụkwọ offset. N'ime mbipụta akwụ ụgwọ, ihe oyiyi a ga-ebipụta na-abịa site na mpempe akwụkwọ aluminom kpuchie, na-etinye gburugburu cylinder obibi akwụkwọ. A na-emeso aluminom ka elu ya bụrụ hydrophilic (na-adọta mmiri), ebe a na-emepụta efere PS mepụtara ...
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