1. Rau kev siv ib zaug, feem ntau yog siv rau cov kua ua kua thiab tso zis tom qab ua haujlwm.2. Yooj yim nyeem nplai rau kev txiav txim siab ceev ntawm unine ntim.3. Lub valve tsis rov qab los nthuav tawm cov zis rov qab.4. Hanging qhov tsim los ntawm nws, yooj yim kho rau ntawm txaj thiab tsis cuam tshuam rau qhov qub.5.Raws li cov neeg siv khoom xav tau, peb tuaj yeem tsim qhov koj xav tau.
