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
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統計: A(1), B(7), C(1), D(1), E(1) #3224670
統計: A(1), B(7), C(1), D(1), E(1) #3224670