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[单选题]
如图所示，设某热力学系统经历一个由c→d→e的过程，其中，ab是一条绝热曲线，a、c在该曲线上．由热力学定律可知，该系统在过程中[]
A
B
不断向外界放出热量．
C
b.
不断从外界吸收热量．
D
c.
有的阶段吸热，有的阶段放热，整个过程中吸的热量等于放出的热量．
E
d.
有的阶段吸热，有的阶段放热，整个过程中吸的热量大于放出的热量．
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试题答案：
D
答案解释：
把cdec看做正循环过程。整个循环过程与外界的热交换Q=w>0，ec为绝热过程，只有cde过程与外界有热交换。所以cde为吸热过程。又由于这是一个循环过程，不能仅吸热而不放热。因此在cde过程中有的阶段吸热，有的阶段放热，整个过程中吸的热量大于放出的热量。
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