一系统由图示的状态 a 经 acb 到达状态 b ,系 统吸收了 350J的热量,同时对外作功126J。如果沿 adb 进行,则系统对外作功 42J,问此过程系统吸收了多少热量?
A.
266J
B.
308J
C.
286J
D.
328J
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