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atomic number 61    我要挑错精准翻译

参考词典中atomic number 61的常规释义:

英英解释
  •  1个名词解释

    1. a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
      [同] atomic number 61, pm, promethium
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