1.Ubusanzwe bikoreshwa mubikoresho bidasanzwe, polyethylene nibikoresho byiza cyane, nyuma yikigereranyo runaka, birashobora kuba ubwinshi bwimyororokere, ingaruka nziza zo kubika, uburemere buke butwara ibikoresho byo kubika ubukonje. Isahani ya polyurethane nibyiza cyane, irinze neza .. .
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