Qhov no yog lub Hoobkas tsim khoom siv refractory ua ntej hauv lub tebchaws, tus neeg muab khoom tseem ceeb ntawm cov ntaub ntawv castable rau kev lag luam thoob ntiaj teb. Raws li qhov kev thov nce ntxiv ntawm cov khoom sib tov zoo, peb cov neeg siv khoom hloov cov khoom sib tov European qub nrog peb cov khoom sib tov siab, txij li nws thawj zaug hloov hauv xyoo 2015, lawv tau nthuav dav 4 kab ntau lawm tshiab rau cov khoom sib xyaw ntau yam.
Lub sijhawm tshaj tawm: Lub Rau Hli-11-2020
