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protactinium是什么意思

protactinium

美[ˌproʊtæk'tɪniəm]  英[ˌprəʊtæk'tɪniəm]
n.  [化]鏷
  简写符号:Pa
  近义词:pa,protoactinium,

英英释义

Noun
  1. a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
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