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理学
放射性元素
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radium
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天然放射性元素,元素符号Ra,原子序数88,半衰期最长的同位素的质量数226,属周期系ⅡA族,碱土金属元素。英文名来源于拉丁文radius(射线)。
Astronomy
全称:radium。缩写:Ra
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Chemistry
>放射化学与辐射化学>放射性元素化学>释义
radium
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sound amplification
sound amplifier operator on site
sound arrester
sound articulation
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sound beam
sound board
sound broadcasting
sound buoy
sound calibrator
sound card
sound change
sound channel
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