Physics Unit15: Laws of Thermodynamics (id: 80b6b4d27)

本题目来源于试卷: Physics Unit15: Laws of Thermodynamics，类别为 通用国际物理

[单选题]
A heat engine receives 7000 J of heda (p;6ovtfax,xav 5/at a/c1dzu /c q-e xsv;r(tf)e +cond loses 3000 J in each cycle. What is the cq1 cct+-z s;df ex/ov eru/()efficiency?

A. 57%
B. 30%
C. 70%
D. 43%


参考答案:  A


本题详细解析: 暂无

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