What is the topic of the passage? What was essential to a science of refrigeration ac. cording to the passage?

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问题 What is the topic of the passage?
What was essential to a science of refrigeration ac. cording to the passage?

选项

答案Knowledge of the physics of heat.

解析 由题干关键词a science of refrigeration定位到原文第二段第二句话,...the knowledge of the physics of heat, which was essential to a science of refrigeration直接给出了问题的答案。
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