Txiav txim siab siv: Txawm hais tias yuav ntim khoom hauv tsev txhua hnub- cov zaub mov ua noj lossis tshem tawm cov zaub mov hauv tsev noj mov, xaiv qhov loj thiab cov khoom siv.
Tshawb xyuas Airtightness: xyuas kom lub hau haum snugly tiv thaiv lub thawv lub cev kom tiv thaiv kev nchuav thiab xau.
Xaiv Cov Khoom Siv: Ua ntej zaub mov- qib yas lossis ntawv- cov khoom siv los xyuas kom muaj kev nyab xeeb thiab tsis yog - tshuaj lom.
Xav txog Kev Muaj Peev Xwm: Xaiv qhov loj me raws li qhov ntim ntawm cov zaub mov kom tsis txhob pov tseg lossis ntim ntau dhau.
Tshawb xyuas: Xaiv rau cov hom lag luam nrog lub koob npe nrov, vim qhov no muaj kev ruaj ntseg zoo dua.
