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All city-states of northern Italy belonged to the Holy Roman Empire during the Renaissance。()

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Romance combined features of both vernacular epic and vernacular lyric。()

水中含有哪些杂质?如果这种水用作锅炉给水,有什么危害?

According to Aristotle, Form. (or Idea) exists as a higher reality than the material world。()

苟性脆化产生的条件有哪些?供热锅炉防止苟性脆化的主要措施是什么?锅炉排污能否防止苟性脆化?

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