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【简答题】
在两个恒温热源之间工作的动力循环系统其高温热源温度T 1 =1000K，低温热源温度T 2 =320K。循环中吸热过程的熵变△s 1 =1.0kJ/(kg·K)，吸热量q 1 =980kJ/kg；放热过程的熵变△s 2 =-1.020kJ/(kg·K)，放热量q 2 =600kJ/kg。
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