What is the topic of the passage? [br] What was essential to a science of refrig

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问题 What is the topic of the passage? [br] 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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