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放射性元素
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promethium
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人工放射性元素,元素符号Pm,原子序数61,半衰期最长的同位素的质量数145.0,属周期系ⅢB族,镧系元素、稀土元素。由希腊神话中从天庭盗取火送到人间的英雄普罗米修斯(Prometheus)而命名。
Chemistry
>放射化学与辐射化学>放射性元素化学>释义
promethium
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Plana
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Plan and Implement of Museum Exhibitions
planar
planar alignment
planar arrangement of lines
planar body
planar chirality
planar chromatography
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planar connected graph
planar contact network
planar coordinate
planar crossed force system
planar crystallographic group
planar curve
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planar domain
planar Doppler velocimetry
planar electrode
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