Koob cov menyuam bearings yog qhov txawv rau lawv cov qauv tsim, thiab cov yam ntxwv no ua rau lawv tshwj xeeb rau kev siv hauv tshuab qhov chaw uas qhov chaw radial txwv.
Yog tias koj txaus siab rau peb cov khoom, koj tuaj yeem xaiv tawm koj cov ntaub ntawv ntawm no, thiab peb yuav tiv tauj koj sai sai.