Ntxiv Cov Khoom Siv Ntxiv Txheeb Xyuas Cov Khoom Siv Khoom Siv

Log xuab zeb tshuab ntxhua khaub ncaws tsheb kom do thiab tshem impurities nyob rau hauv cov khoom siv los xyuas kom cov khoom siv zoo ntawm cov xuab zeb ntxuav.

Nrog nws cov chaw kho kom tau zoo thiab cov hluav taws xob tsawg, peb lub log tshuab ntxhua khaub ncaws yog qhov zoo tagnrho rau  kev siv  no, thiab ntau lawm.

Lub log tshuab ntxhua khaub ncaws NTA

1. Tus qauv tsim nyog thiab kev saib xyuas yooj yim.

2. Cov khoom muaj peev xwm loj dua, siv hluav taws xob me.

3. Qib siab ntawm kev ntxuav tu, tsawg dua cov khoom ntxuav tsis tshua muaj.

4. Siv hluav taws xob tsav, ua haujlwm ruaj khov, thiab lub suab yau.