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The rate at which a material heats up depends on its chemica

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The rate at which a material heats up depends on its chemical composition.分析at which ?
分析一下at which作的句子成份,应该怎么来分析这个句子的结构?分析结构,不是意思
The rate( at which a material heats up) depends on its chemical composition.
句子主干:The rate depends on its chemical composition.
at which a material heats up做的是The rate的定语
这是一个定语从句