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单词
promethium
释义
promethium
/preuh mee"thee euhm/
,
n. Chem.
a rare-earth, metallic, trivalent element.
Symbol:
Pm;
at. no.:
61.
[
1945-50; < NL; see PROMETHEUS, -IUM
]
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更新时间:2025/4/25 18:56:40