本题目来源于试卷: Physics Unit15: Laws of Thermodynamics，类别为 国际高中通用物理
[单选题]
One of the most efficient engines built s.j (x6d r0zuveo fajs rh3wmo ; hoozp+(8o- pg9)hr has the following characteristics: combustion cp j3woz;poh)h(-g oho9rsm +8hamber temperature = $1900 ^{\circ}C$, exhaust temperature = $430 ^{\circ}C$, $7.0 \times 10^{9} \; cal$ of fuel produces $1.4 \times 10^{10} \; J$ of work in one hour. What is the actual efficiency of this engine?
A. 32%
B. 48%
C. 52%
D. 68%
参考答案: B
本题详细解析:
暂无
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