Qhuav tshuaj lub rooj zaum tsotawmhluav taws kublos ntawm coating cov roj nrog nyias txheej ntawmtso tsegretardantHmoov,sib cais tus roj tsheb ntawmCov pa oxygen. Cov hmoov kuj tseem ua haujlwm rau cov tshuaj tiv thaiv cov tshuaj, uasua tej no lub rooj zaum tiag ua tau rau.
Cov hluav taws tua hluav taws tso tawm li cas tua hluav taws?
Jan 18, 2019
Tso lus
Tom ntej
Koj Tseem Yuav Zoo Li
