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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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optical position
optical potential
optical power and energy meter
optical power meter
optical pressure
optical principal points
optical processing
optical processor
optical properties of atmosphere
optical properties of ceramics
optical properties of crystal
optical properties of ground objects
optical properties of helix alignment liquid crystal
optical properties of liquid crystal
optical properties of materials
optical properties of polymers
optical properties of semiconductor
optical property
optical protection coating
optical proximity effect correction
optical pulsar
optical pulsation
optical pulse
optical pump
optical pumping
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