水中含有哪些杂质?如果这种水用作锅炉给水,有什么危害?
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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?
The Romans were extremely intolerant of foreign religions。()
Ptolemy’s geocentric theory remained very popular in Europe for centuries。()