1.Thaum qhov kub nce ntxiv, thov nco ntsoov tias lub nruas yog ua kom tsis txhob hlawv cov ntawv pam.
2.Thaum lub tshuab ua haujlwm, ib tug neeg yuav tsum nyob nrog nws kom tsis txhob muaj kev sib tw ua haujlwm ntawm daim pam.
3.Cov khoom siv hluav taws xob txiav qis qis rau qhov ntsuas kub, thov cais tawm ntawm lub nruas kom ntev tshaj plaws nrug tes log ib zaug. Tso qee cov ntawv boardswhich tuaj yeem tiv thaiv daim pam los ntawm kev kub hnyiab tawm.Thaum koj khiav themachine dua, thov hloov cov ntawv ntoo cov khoom tawm kom deb thiab ua raws cov kev qhia ua haujlwm kom rov ua haujlwm dua.
4.Qe hauvarings ntawm lub tshuab tag nrho yuav tsum tau muab roj los rauib zaug ib lub lim tiam tsawg kawg ntawm kev txiav tximrauua kom ntseeg taulub bearingsua haujlwm zoo.
