Kev siv cov khoom siv rov ua dua tshiab rau thawj lossis qib thib ob huv ABS cov khoom siv rov ua dua tshiab uas tsis muaj qhov tsis huv thiab tsis muaj cov khoom tawg, lawv tuaj yeem siv ncaj qha tom qab tsoo, lossis sib xyaw nrog cov ntaub ntawv tshiab, thiab qhov sib xyaw feem ntau tsis ntau dua li cov khoom siv tshiab.
25%, yog li tsis cuam tshuam rau kev ua haujlwm. Rau cov khoom siv rov ua dua tshiab uas tau rov tsim dua ntau dua 5 zaug lossis ntxiv nrog cov xim, feem ntau lawv tsis sib xyaw nrog cov ntaub ntawv tshiab, feem ntau yog txhawm rau tiv thaiv qhov sib txawv xim.
Txawm hais tias nws yog cov khoom siv rov ua dua tshiab lossis cov khoom siv rov ua dua tshiab sib xyaw nrog cov khoom siv tshiab, nws yuav tsum tau qhuav raws li txoj cai ua ntej nws tuaj yeem muab tso rau hauv kev ua moulding.