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[单选题]
如图,温度为
如图,温度为
,
,
三条等温线与两条绝热线围成三个卡诺循环:(1) abcda,(2) dcefd,(3) abefa,其效率分别为
____________,
____________,
____________
A.1/3;1/2;2/3;
B.1/2;1/3;2/3;
C.2/3;1/3;1/2;
D.2/3;1/2;1/3;
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