Cov khoom siv ntawm cov qhov rooj hluav taws yuav tsum tau txais kev tiv thaiv hluav taws kom ua tau raws li qhov kev txwv kev tiv thaiv hluav taws. Txawm hais tias lub qhov rooj hluav taws zoo li cas, lub sijhawm hluav taws kub ntawm chav C hluav taws kub yuav tsum tsis pub tsawg dua 0.5 teev.