Thaum muas cov yeeb nkab dabtsi yog khoov tshuab, cov hauv qab no tseem ceeb yuav tsum tau xav txog:
Khoov qhov tseeb: Xaiv lub tshuab dabtsi yog khoov nrog qhov tseeb raws li qhov tuab thiab cov khoom siv ntawm cov hlau yuav tsum tau khoov, nrog rau qhov yuav tsum tau khoov lub kaum sab xis.
Cov cuab yeej ua haujlwm: Xav txog qhov zoo thiab ua haujlwm ntawm cov khoom siv hydraulic, hluav taws xob, thiab pwm.
Kev ua haujlwm yooj yim: Xaiv cov khoom siv uas yooj yim rau kev khiav lag luam, kho, thiab tswj kom txhim kho kev ua haujlwm.
Tom qab- kev muag khoom: Xaiv lub hom lag luam uas muab qhov zoo tom qab- kev muag khoom los xyuas kom meej tias txhua yam teeb meem tshwm sim thaum siv cov cuab yeej tuaj yeem daws tau sai.