Yog, tau kawg. Peb lub ntsiab lus tseem ceeb:
1. Ntau tshaj 20 xyoo kev xa khoom tawm, kev txhim khu kev qha zoo tau txais ntau tus neeg siv khoom tsis tu ncua thiab cov lus tawm tswv yim zoo.
2. Txhua yam khoom yuav tsum tau kuaj thiab tshuaj xyuas nruj me ntsis, tom qab ntawd tso cai xa khoom.
3. Peb muaj daim ntawv pov thawj ISO, CE.