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单词 极小量
释义 〔shred〕A small amount; a particle:很少的量;极小量〔polonium〕A naturally radioactive metallic element, occurring in minute quantities as a product of radium disintegration and produced by bombarding bismuth or lead with neutrons. It has 27 isotopes ranging in mass number from 192 to 218, of which Po 210, with a half-life of 138.39 days, is the most readily available. Atomic number 84; melting point 254°C; boiling point 962°C; specific gravity 9.32; valence 2, 4. See table at element 钋:一种具有天然辐射性的金属元素,作为镭分裂的产物以极小量出现,可通过用中子轰击铋或铅获得。它从192到218的质量数中可排列为27种同位素,其中的钋210半衰期达138.39天,是最易得到的同位素。原子序数84;熔点254°C;沸点962°C;比重9.32;化合价2, 4 参见 element〔particle〕A very small or the smallest possible amount, trace, or degree:极小量:可能达到的非常小或最小的数量、痕量或程度:
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