Na mmepụta mmepụta ihe, mmanụ bụ ihe dị mkpa na ihe dị mkpa.Nzacha mmanụ na-adaba ụzọ abụọ: 1. Mmanụ crude mmanụ bụ ngwakọta dị mgbagwoju anya nwere hydrocarbons dị iche iche, sulfides, ogige nitrogen, wdg, nke nwere ike imebi akụrụngwa na t ...
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