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 7 d(trbr +o4k7w,(n9r8fak x opo od0nu;zb7dheat and loses 3000m)w 8mm*orfj* ;wl q):gaz z/y J in each cycle. What is the efficiel*ym/g:m;w f z*8q))ma z orwjncy?

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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