1. Lub tshuab hluav taws xob tshiab rub tawm tau yooj yim thiab txuag zog.
2. Hom peb-puab tsaig thiab ob-lub puab tsaig hom tuaj yeem hloov pauv raws li qhov xav tau ntawm kev ua haujlwm.
3. Nws tuaj yeem tig mus raws li qhov kev ncua deb ntawm tus rub tawm thiab nruab nrab ntawm lub piston, thiab nws tuaj yeem kov qhov chaw nruab nrab ntawm cov haujlwm rub.
4. Lub twj tso kua mis tuaj yeem xaiv kev lim hiam.
5. Kev siv tau yooj yim, lub teeb yuag, me me me, nqa tau yooj yim, cov cuab yeej zoo tagnrho rau cov chaw ua haujlwm, nkoj, thiab chaw kho.
