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
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