| 单词 | noble metal |
| 释义 | noble metal (once / 129883 pages) n WORD FAMILY noble metal: noble metals USAGE EXAMPLESBut gold, and other noble metals that work just as well, are expensive. Science Magazine(Apr 27, 2016) For example, the electrochemical stabilities of noble metals such as platinum and gold fall sharply as their dimensions decrease to nanometre scales. Nature(Nov 24, 2015) “Gold is a noble metal and is not affected by air or water,” he said. New York Times(Feb 18, 2015) n any metal that is resistant to corrosion or oxidation Hypo|Hyper Au, atomic number 79, gold a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia Pt, atomic number 78, platinuma heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits Ag, atomic number 47, silvera soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography 24-karat gold, pure gold100 per cent gold gold dustthe particles and flakes (and sometimes small nuggets) of gold obtained in placer mining coin silvera silver of the degree of purity established for making legal silver coins green golda gold alloy (at least 14 karat gold with silver or silver and cadmium) that has a green appearance guinea gold22-karat gold from which guinea coins were made metal, metallic element any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
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