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单词
protactinium
释义
protactinium
/proh'tak tin"ee euhm/
,
n. Chem.
a radioactive, metallic element.
Symbol:
Pa;
at. no.:
91.
Also,
protoactinium
.
[
1915-20; PROT- + ACTINIUM
]
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更新时间:2025/3/10 8:41:18