Nkebi ahịrịokwu 1: Ihe kachasị mkpa nke phosphorus acid (phosphonic acid) bụ mmepụta nke phosphite bụ isi, nke bụ onye na-eme ka ọ dị na PVC na ndị ọzọ na-ejikọta chlorinated polymers. Nkebi ahịrịokwu 2: Ihe kachasị mkpa nke phosphoric acid (phosphoric acid) bụ mmepụta nke phosphite bụ isi, nke bụ onye na-eme ka ọ dị na PVC na ndị ọzọ na-ejikọta chlorinated polymers. Ajụjụ: Ọ̀ bụ otu ihe ka ahịrịokwu nke mbụ na nke abụọ pụtara? Ee ma ọ bụ Ee e?
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