Nta:
1. Cov khoom siv kev nyab xeeb: 100 feem pua cov ntaub ntawv tshiab cw617n tooj dag, cov ntsiab lus Cu siab 57-59 feem pua, cov ntsiab lus Pb qis 1.6-2.5 feem pua, noj qab nyob zoo thiab ib puag ncig zoo.
2. Kev tswj xyuas nruj: IFAN Hoobkas muaj kev tswj xyuas nruj, thaum lub sijhawm tsim khoom, peb yuav kuaj cov khoom siv raw, cov khoom tiav thiab cov khoom tiav kom paub meej qhov kawg.
3. Yooj yim rau nruab: qhov haum tuaj yeem hloov kho kom haum rau cov yeeb nkab.
