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promethium是什么意思

promethium

美[prə'miːθiəm]  英[prə'miːθiəm]
n.  [化]钷(稀土金属元素;符号 Pm;原子序61)
  简写符号:Pm
  近义词:PM,

英英释义

Noun
  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
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