阿摩線上測驗
40. In process ab, 20 J of heat is added to the system. In process bd, 80 J of heat is added to the system. Find the internal energy change ΔU in process acd? 
(A) 0 J
(B) 20 J
(C) 59 J
(D) 79 J
(E) 100 J
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統計： A(0), B(0), C(1), D(37), E(6) #2356601
統計： A(0), B(0), C(1), D(37), E(6) #2356601
