Kurikirana ibintu muri peteroli ya kokiya harimo Fe, Ca, V, Na, Si, Ni, P, Al, Pb nibindi. Bitandukanye nkigisubizo isoko yamavuta yinganda zitunganya amavuta, ibice bigize ibintu hamwe nibirimo bifite itandukaniro rinini cyane, ibintu bimwe na bimwe byerekana amavuta ya peteroli muri, nka S, V, kandi biri muri proc ...
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