Cov kav dej tua hluav taws yog cov kav dej loj ntawm cov kav dej tua hluav taws;
Raws li lub npe qhia, lub raj xa hluav taws xob yog lub raj xa hluav taws xob tsim los tiv thaiv hluav taws. Vim muaj kev xav tau tshwj xeeb, cov tuab thiab cov khoom siv ntawm cov kav dej tua hluav taws muaj cov kev cai tshwj xeeb, thiab cov xim liab yog txau los thauj cov dej tua hluav taws.
Cov kav hluav taws tua hluav taws yog hais txog cov khoom siv hluav taws xob uas siv rau kev tua hluav taws, txuas cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob, thiab xa cov dej tua hluav taws, roj lossis lwm yam xov xwm.
Txij li thaum cov kav hluav taws kub feem ntau nyob rau hauv lub xeev zoo li qub, cov kev cai rau cov kav dej yog nruj heev. Lub raj xa dej yuav tsum tiv taus siab, corrosion thiab kub kub.
