1. Thaum ntim cov khoom, qhov kub ntawm cov khoom ntim yuav tsum ua raws li qhov kub ntawm qhov chaw.
2. Cov hnab looj tes yuav tsum tau hnav thaum lub sijhawm ua haujlwm tag nrho kom tsis txhob muaj cov khoom xeb vim yog hws txhais tes.
3. Ua ntej ntim, thov tsis txhob nthuav tawm cov khoom tiv thaiv xeb rau lub sijhawm ntev. Tom qab ntim tiav lawm Nws yuav tsum tau muab kaw kom sai li sai tau. Nws tuaj yeem raug kaw los ntawm kev sib khi thaum tshav kub kub, daim kab xev, cable ties, thiab lwm yam. Cov khoom siv los tiv thaiv xeb uas tsis tau siv yuav tsum tau muab rov qab thiab khaws cia.