Cov lus qhia txog kev xaiv pob zeb

1. Lub pob zeb muaj daim ntawv pov thawj radioactive. Thov nug tus neeg muag khoom rau nws thaum koj yuav nws. Tsis txhob yuav yam tsis muaj daim ntawv pov thawj. Nyob rau tib lub sijhawm, xyuam xim rau kev xaiv ntawm Class A cov khoom siv rau kev kho kom zoo nkauj hauv tsev.
2. Hauv kev xaiv marble thiab granite, marble yuav tsum tau txiav txim siab ua ntej. Raws li ib txwm muaj, cov xov tooj cua ntawm granite yog ntau dua li ntawm marble.
3. Generally, the consideration of stone materials should be black, gray white, flesh red, green and red. From the perspective of radioactivity, the order from high to low is: red>green>flesh red>gray white>white>dub, yeej nyob rau hauv qhov kev txiav txim no.