14. Consider a cyclic process of a thermodynamic system. The Pressure-Volume diagram of this process is shown in the figure. What area in the P-V diagram represents the work done by the system in each cycle?
(A) a
(B) b
(C) c
(D) d
(E) b + d
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統計: 尚無統計資料
統計: 尚無統計資料