Radon

Radon ( dōng) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Rn, ngièn-chṳ́ su-muk he 86.

Chhâm-kháu chṳ̂-liau

Category:Fa-ho̍k ngièn-su