1, roj puv, ntxiv roj ntxiv rau kom hnyav raws li txoj cai, thiab tseem nquag qhib lub qhov tso pa thiab valve qhov chaw thiab ntxuav kev ua kom dredges.
Niam 2, hloov kho screws, screws yuav tsum nruj, tiv thaiv cov txiv ntoo tawg.
3, foob thiab ntxiv rau ua tib zoo tshuaj xyuas cov ntsaws ruaj ruaj raws li Kev Cim Kev Ua Haujlwm.
4, cov khoom siv roj hmab txhawm rau tshuaj xyuas nws cov deformation, tuaj yeem muaj qhov tsis xws luag, kev siv qee lub tshuab rau kev hloov pauv.
5, ntau yam ntawm cov khoom siv tu huv kom qhuav, qhuav, muaj roj muaj mob Yuav kho tau teeb tsa. Cov khoom siv tom qab hloov pauv kev tiv thaiv, xws li kev yaig, qhov chaw tawg.
