2. 外语
  3. The primary purpose of the passage is to ______. According to the passage, the role of the flow restriction(Para. 2) in a heat

The primary purpose of the passage is to ______. According to the passage, the role of the flow restriction(Para. 2) in a heat

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问题 The primary purpose of the passage is to ______.
According to the passage, the role of the flow restriction(Para. 2) 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 见第二段倒数第三、四句，讲到fow restriction可以使压力降低，而压力降低后，refrigerant就会部分汽化并变冷，可知C项符合文意，故选C。
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