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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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salt produced from Lake Hai
salt-producing household
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salt tax in ancient China
Salt Tax Officers
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salt tolerance in crops
salt-tolerant plants
Salt Transportation Department
saltus
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saltwater crocodile
salt-water drilling fluid
salt water-fried
saltwater lakes in China
salt wedge
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