2. 外语
  3. When required in tonnage quantities, oxygen is prepared by the’ fractional distillation of liquid air. The process takes advanta

When required in tonnage quantities, oxygen is prepared by the’ fractional distillation of liquid air. The process takes advanta

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问题 When required in tonnage quantities, oxygen is prepared by the’ fractional distillation of liquid air. The process takes advantage of the fact that when a ______ gas is allowed to expand, it cools. (compress)
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答案compressed
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