Dab tsi yog txoj kev ua thiab kev siv cov khoom ABS?
Cov tawv ntoo tsis zoo, cov dej ntws zoo, lub cev ntim tshuaj, kev sib tsoo, kev sib txuas, kev sib txuas, kev sib txuas thiab kev sib tsoo, kev siv thiab kev ua haujlwm.
ABS khoom yog ib yam tseem ceeb ntawm cov khoom siv hlau, uas yog siv rau hauv kev lag luam tsheb, hluav taws xob thiab hluav taws xob, khoom siv hluav taws xob, cov khoom siv hluav taws xob thiab cov khoom siv hauv tsev. Vim tias vaj tse ntawm ntau yam khoom siv hauv vaj hauv tsev thiab cov twj, khoom siv, hniav, cov khoom siv sab hauv lub cav, thiab lwm yam. Cov khoom siv cav ntoo, cov cav ntoo, lub cav ntim khoom sib txuas,