Hluav taws kub qhov rooj nrog cov khoom sib txawv thiab kev ua haujlwm muaj tus nqi sib txawv, nyob ntawm qhov xav tau. Qhov tseem ceeb tshaj plaws ntawm cov qhov rooj hluav taws yog hluav taws kub thiab hluav taws kub rwb thaiv tsev kev ua tau zoo, uas tau muab faib ua peb hom: A, B, thiab C. Zoo siab txais tos los tham nrog peb.

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