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【单选题】
下列关于兹循环说法错误的是（）。
A.
兹循环是变温热源时的逆向可逆循环
B.
制冷剂在实际工作中，被冷却对象的温度和环境介质的温度往往是随着热交换过程的进行而变化的
C.
兹循环是消耗功最多的循环
D.
兹循环是制冷系数最高的循环
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