316 umuyoboro wibyuma ni umuyoboro udafite ibyuma bizenguruka, bikoreshwa cyane muri peteroli, imiti, ubuvuzi, ibiryo, inganda zoroheje, ibikoresho bya mashini nibindi bikoresho byinganda ninganda zubaka.Mubyongeyeho, muburyo bumwe bwo kugonda, imbaraga za torsional, uburemere bworoshye, nuko rero ...
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