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词汇 actinium
释义
actinium
noun [ U ] uk/ækˈtɪn.i.əm/ us/ækˈtɪn.i.əm/
(symbol Ac)
a chemical element that is a soft, silver-white metal and is radioactive
Researchers are testing the actinium. 研究者正在测试锕。
    更多例句
  • Thorium decays into a radium isotope, and then into actinium, which has a 10-day half-life.
  • Projected future needs for actinium and bismuth are high.
  • Various alternative processes have been proposed for making actinium.
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