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Encyclopedia
理学
放射性元素
释
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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outer variable
outer volume
outfan
out filed
out-filed
outfire
outfit
out flow
outflow
outflow boundary condition
out flow valve
outgas
outgassing
outgoing angle
outgoing channel
outgoing edge
outgoing particle
outgoing quality
outgoing quality control
outgoing quality control, OQC
outgoing subspace
outgoing traffic
outgoing vector
outgoing wave
outgroup
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