| 单词 | platinum metal |
| 释义 | > as lemmasplatinum metal platinum metal n. (frequently in plural) any of a group of similar metallic elements of the transition series often associated in ores, comprising platinum, iridium, palladium, osmium, rhodium, and ruthenium. ΘΚΠ society > occupation and work > materials > derived or manufactured material > metal > base metal > [noun] > metals of platinum group platinum metal1842 platinoid1881 1842 T. Graham Elem. Chem. II. v. 694 Rhodium is the most oxidable of the platinum metals. 1934 B. Emeny Strategy Raw Materials v. 117 Considerable concern arose during the World War as to whether demands for platinum metals could be met. 1992 D. M. Elsom Atmospheric Pollution (ed. 2) (BNC) 203 Its construction is similar to the oxidation catalyst except that it uses a different mixture of platinum metals. < as lemmas |
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