The element immediately following hydrogen is helium, the atom which contains two electrons.
The element immediately following hydrogen is helium, the atom which contains two electrons.
发布时间：2026-02-03 07:43:22
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答案：of
【分析】:本题考查“介词＋引导词”在定语从句中作主语的定语的情况。根据上下文，需要介词of，表示“的”，of which引导的定语从句作atom的定语。请参考第8题的答案解析。
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