Feem ntawm daim ntawv thov:
Zh
Cov thawv ntim khoom yas yog siv feem ntau rau kev khaws thiab thauj cov kua ntau. Lawv muaj cov yam ntxwv zoo rau cov khoom txaus ntshai tshwj xeeb. Lawv muaj cov yam ntxwv ntawm tsis tawg, xeb, lub teeb, thiab tsis yooj yim deformed. Lawv kuj muaj cov roj ua tau zoo thiab muaj zog corrosion kuj. Nws yog siv rau kev ntim khoom ntawm cov khoom txaus ntshai uas xav tau rwb thaiv tsev kub, noo noo tsis kam, siab tiv taus thiab tiv taus corrosion. Feem ntau siv los tuav cov khoom siv tshuaj, tshuaj tua kab, roj nplua nyeem, pleev xim, tshuaj lag luam, khoom noj khoom haus, khoom siv khoos phis tawm, electromechanical thiab lwm yam kev lag luam ntawm cov kua thiab cov khoom lag luam.
