单词 | 可消除 |
释义 | 〔ineradicable〕ineradicable stains.不可消除的污点〔technetium〕A silvery-gray radioactive metal, the first synthetically produced element, having 14 isotopes with masses ranging from 92 to 105 and half-lives up to 2.6×106 years. It is used as a tracer and to eliminate corrosion in steel. Atomic number 43; melting point 2,200°C; specific gravity 11.50; valence 0, 2, 4, 5, 6, 7. See table at element 锝:一种银灰色放射性金属,是第一个人工合成的元素,有十四个原子量从92到105且半衰期高达2.6×106年的同位素。用作放射追踪剂并可消除钢铁腐蚀现象。原子序数43;熔点2,200°C;比重11.50;原子价0, 2, 4, 5, 6, 7 参见 element |
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