Kev tsim thiab kev ua haujlwm ntawm cov tshuab foob yog qhov nyuaj, suav nrog ob peb yam tseem ceeb. Lawv yog tsim los ntawm lub ntsej muag foob, elastomers, cov ntsaws ruaj ruaj, thiab cov khoom siv kho vajtse, txhua tus muaj cov yam ntxwv tshwj xeeb thiab lub hom phiaj. Cov khoom tseem ceeb ntawm lub tshuab foob muaj xws li: Rotating Face (Primary Ring) ...
Nyeem ntxiv