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那个，为什么有说每个水分子中有四个氢键也有说有两个氢键的，或者问什么时候说是四个什么时候说是两个？ 知乎 Template






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tomski那个，为什么有说每个水分子中有四个氢键也有说有两个氢键的，或者问什么时候说是四个什么时候说是两个？ 知乎 coloring
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