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共价键
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共价键covalent bond 【化】 covalent bond covalent link(age)共价键gòngjiàjiàn[covalent bond] 一种非离子键,是由两个原子共享一对电子而形成的,这一对电子或者原来属于一个原子,或者原来分属于两个原子
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