問題詳情
19.現欲在一絕熱杯內，利用0°C的冰和加熱剛達100°C的沸水混合，調製出20°C 450克的水，若分別取用x克的冰和y克的沸水，則 
之值為若干？（冰的熔化熱80卡／克）
(A)
(B)
(C)
(D)
(E)
。
之值為若干？（冰的熔化熱80卡／克） (A)
(B)
(C)
(D)
(E)
。
參考答案
答案：[無官方正解]
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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