Cov haujlwm ntawm theem nqa tau yog suav nrog cov hauv qab no:
Hloov cov duab thiab qhov siab ntawm cov theem thiab qhov siab nqa tuaj yeem hloov cov qauv ntawm ntau theem lossis cov kauj ruam ntawm cov phiaj xwm sib txawv kom tau raws li cov kev xav tau sib txawv.
Sai sai hloov cov toj roob hauv pes: kev siv lub cuab tam tau hloov kho lub keeb kwm yav dhau los, thiab txhim kho qhov kev thov rov hais dua ntawm zaj yeeb yaj kiab.
Thauj cov neeg ua yeeb yam thiab hloov cov xwm txheej tseem ceeb tuaj yeem koom nrog kev ua yeeb yam, siv rau cov neeg ua yeeb yam rau thiab tawm ntawm theem, tsim cov chaw zoo, thiab lwm yam.
Ntau tus qauv tsim: Ntxiv rau qhov kev ua haujlwm ntawm kev nqa khoom, qee qhov kev ua haujlwm xws li kev sib hloov thiab tilting, yog li theem theem tau tuaj yeem muab tau nyob rau hauv tus neeg muaj kev sib raug zoo. Nyob rau tib lub sijhawm, nws txhawb kev tswj chaw taws teeb, uas txhim kho qhov hloov tau thiab kev nyab xeeb ntawm kev ua tau zoo.
Kev tiv thaiv kev nyab xeeb kev nyab xeeb: qhov kev ntsuas tus kheej, txwv, ntsuas kev sib tw, kev tiv thaiv hydraulic, ruaj khov thiab txhim khu kev qha ntawm cov khoom siv.