Iyini ikhebula elivumela imvelo futhi yiziphi izici zayo?Izintambo ezihambisana nemvelo zibhekisela kumakhebuli angenazo izinsimbi ezisindayo ezifana nomthofu, i-cadmium, i-chromium ene-hexavalent, i-mercury, njll., aziqukethe izinto ezibuyisela amalangabi e-brominated, ezingakhiqizi amagesi e-halogen ayingozi,...
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