| 单词 | Metals,Rare Earth |
| 释义 | Metals,Rare Earth《英文msh词典》Metals,Rare Earth [主题词] Metals,Rare Earth [同义词] Rare Earth Metals [入口词] Earth Metals,Rare [中文释义] 金属,稀土 [英文释义] A group of elements that include SCANDIUM,YTTRIUM; and the LANTHANOID SERIES ELEMENTS. Historically,the rare earth metals got their name from the fact that they were never found in their pure elemental form,but as an oxide. In addition they were very difficult to purify. They are not truly rare and comprise about 25% of the metals in the earth's crust. |
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