I. Iingcamango zoyilo olusisiseko: Ngokweemfuno ezisisiseko zamalungu eplastiki kunye neempawu zenkqubo yeplastiki, hlalutya ngokucophelela ukwenziwa kwezinto zeplastiki, ukugqiba ngokuchanekileyo indlela yokubumba kunye nenkqubo yokubumba, khetha i-mold yeplastiki yesitofu esifanelekileyo ...
Funda ngokugqithisileyo