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工学
慢化剂材料
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beryllium
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化学元素。元素符号Be,原子序数4,原子量9.012182,属周期系IIA族。碱土金属中最轻的一种元素。
理学
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释
beryllium
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化学元素,元素符号Be,原子序数4,原子量9.0121831(5),属周期系ⅡA族。碱土金属。
Astronomy
全称:beryllium。缩写:Be
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Chemistry
>无机化学>无机化学基本概念与无机化合物>释义
beryllium
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physical system of manufacturing process
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Physical Training for Female Operatic Characters
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