Tuubooyinka birta ee kaarboon waxa laga sameeyaa bir ama bir wareegsan oo adag iyada oo loo marayo godadka si ay u sameeyaan dabool, ka dibna lagu sameeyo duubid kulul, duubid qabow ama sawir qabow. Tuubooyinka birta kaarboon waxay boos muhiim ah ku leeyihiin warshadaha tuubada birta ee Shiinaha Alaabta muhiimka ah waxay u badan yihiin q235, 20#, 35...
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