本题目来源于试卷: Physics Unit14: Heat，类别为 国际高中通用物理
[单选题]
The heat of fusion of lead is 5.q8x6 (y7gnzz0 2lgd ;laumv+ vsdl76l iv )war6vh;s 2)hj f3akxe)t1 9 kcal/kg, and the heat of vaporization is 207 k kt2e;3vfa6v)ix)s)wh1jha r cal/kg, and its melting point is $328 \; ^{\circ}C$. How much heat is required to melt 50 g of lead initially at $23 \; ^{\circ}C$? (The specific heat of lead is $0.031 \; kcal/kg \cdot ^{\circ}C$)
A. $678 \; cal$
B. $687 \; cal$
C. $768 \; cal$
D. $876 \; cal$
参考答案: C
本题详细解析:
暂无
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