31. 由圖所知,冷凍效果為何?

(A)241.07 kcal/kg
(B)35.84 kcal/kg
(C)6.277 kcal/kg
(D)29.57 kcal/kg

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統計: A(0), B(0), C(0), D(1), E(0) #3991477