英语词汇“niobium”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	niobium
释义	ni·o·bi·um (nī-ōbē-əm) n. Symbol Nb A silvery, soft, rare, ductile metallic element that occurs chiefly in columbite-tantalite and is used in steel alloys, arc welding, and superconductive materials. Atomic number 41; atomic weight 92.906; melting point 2,477°C; boiling point 4,744°C; specific gravity 8.57; valence 2, 3, 5. See Periodic Table. [After NIOBE (so called because it is extracted from tantalite).]
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