Ihe eji eme rọba bụ resin sịntetik, nke a na-amịpụta ma mekwa ya site na mmanụ ala, gas sitere n'okike ma ọ bụ mgbawa coal.A na-emebi mmanụ, gas, wdg n'ime ogige organic dị ala (dị ka ethylene, propylene, styrene, ethylene, mmanya vinyl, wdg), na obere molekul ...
GỤKWUO