Raws li cov khoom siv thiab cov khoom siv ua haujlwm, lub tog raj kheej hydraulic, zoo li txhua yam khoom siv tshuab, yuav tsis muaj kev sib txawv ntawm kev hnav, qaug zog, corrosion, loosening, laus, deterioration los yog puas nyob rau hauv nws cov yam ntxwv Cheebtsam nyob rau hauv lub sij hawm ntev ua hauj lwm.Phenomenon, ...
Nyeem ntxiv