Hluav taws kub ntsuas qhov rooj steel qhov rooj nplooj tuab yog muab faib ua peb tus qauv, A, B, C, thiab muaj lub suab rwb thaiv tsev zoo thiab kev ua haujlwm kub. Steel qhov rooj hluav taws tuaj yeem muab cov qhov rais, qhov rooj kaw, qhov cua qhov rooj, thiab lwm yam raws li qhov xav tau. Txais tos kom sab laj peb.

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