Ubwa mbere, igitekerezo cyibanze hamwe nuburyo bukoreshwa mubyuma byububiko bwa karuboneIcyuma cyububiko bwa karubone bivuga ibikoresho byibyuma birimo karubone itarenze 2.11%, ikoreshwa cyane mubikorwa, ubwubatsi, metallurgie, kubaka ubwato, gukora imashini, peteroli na chimique i. ..
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