“actinium”的概念、定义、翻译、参考文献-科学参考

单词	actinium
释义	actinium [ak`tin·ē·ǝm] ^CHEMISTRY A radioactive element, symbol Ac, atomic number 89; its longest-lived isotope is ²²⁷Ac with a half-life of 21.7 years; the element is trivalent; chief use is, in equilibrium with its decay products, as a source of alpha rays.
随便看	orthodromic projection ortho-ethyl\\(O-2,4,5-trichlorophenyl\\)ethylphosphono-thioate orthoferrosilite orthogenesis orthogeosyncline orthognathic orthogneiss orthogonal orthogonal antennas orthogonal basis orthogonal complement orthogonal crystal orthogonal family orthogonal functions orthogonal group orthogonality orthogonalization orthogonalized plane-wave method orthogonal Latin square orthogonal lines orthogonal matrix orthogonal parity check orthogonal polynomial orthogonal projection hemocoel

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