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Mesothorium

资料来源 : pyDict

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资料来源 : Webster's Revised Unabridged Dictionary (1913)

Mesothorium \Mes`o*tho"ri*um\, n. [NL.; meso- + thorium.]
   (Chem.)
   A radioactive product intermediate between thorium and
   radiothorium, with a period of 5.5 years.
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