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  3. The primary purpose, of the passage is to______ According to the passage, the role of the flow restriction in a heat pump is to

The primary purpose, of the passage is to______ According to the passage, the role of the flow restriction in a heat pump is to

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问题 The primary purpose, of the passage is to______
According to the passage, the role of the flow restriction in a heat pump is to______
选项 A、measure accurately the flow rate of the refrigerant-mass at that point
B、compress and heat the refrigerant vapor
C、bring about the evaporation and cooling of refrigerant
D、exchange heat between the refrigerant and the air at that point
答案C
解析 第二段第二至六句指出，制冷剂开始是以一种低温低压的气体进入压缩机，然后以高温和压缩的气体进入冷凝器，成为高压和冷却的液体，由于制冷剂的限制，压力下降，制冷剂膨胀并蒸发，变得冷却。
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考研英语一

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