更多platina例句

1. An exceedingly few rays of the sun, concentrated by a burning mirror, will convert gold and platina into vapor.
2. Nitrous acid dissolves all metallic substances except gold and platina, and in the solution nitrous air is produced.
3. Neither this acid nor the nitrous will dissolve gold or platina; but a mixture of them, called aqua regia, will do it.
4. Pure platina is the heaviest body in nature, its specific gravity exceeding twenty-two.
5. Also most of the metals precipitate platina, but not in its metallic state.