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平均动脉压在一定范围内升降，脑血管可相应的收缩或舒张，以保持脑血流量相对恒定，属于_________
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Categorization is the process of classifying our experiences into same categories based on commonalities and differences. As a major ingredient in the creation of human knowledge, it allows us to relate present experiences to past ones.
Root refers to the base form of a word that can be further analyzed without loss of identity.
下列内容中应记录在既往史中的是_________
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