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helium
释义
helium
Encyclopedia
理学
氦
释
helium
氦
化学元素,元素符号He,原子序数2,原子量4.002602(2),属周期系零族元素,稀有气体。
Physics
helium
氦
2He
{化}
Astronomy
helium
缩写:He。氦
Chemistry
>无机化学>无机化学基本概念与无机化合物>释义
helium
氦
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sub-Riemannian manifold
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