- platinium
- 2017-01-17 20:06
- size:100mm>=Platinum is a chemical element with the chemical symbol Pt and an atomic number of 78. Its name is derived f
- gold
- 2017-01-17 20:06
- Gold (pronounced /'go?ld/) is a chemical element with the symbol Au (from Latin: aurum, "shining dawn", hence adjective,