問題詳情

24. A heat pump has a coefficient of performance of 4. If the heat pump absorbs 20 cal of
cold outdoors in each cycle, the heat expelled (in cal) to the warm indoors is about
(A) 14
(B) 27
(C) 40
(D) 48
(E) 77

參考答案

答案：B

統計：A:0,B:0,C:0,D:1,E:0

難度：計算中