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【简答题】
空气初态为p1=0.1MPa、t1=20℃，经过三级活塞式压气机后，压力提高到12.5MPa，假定各级压力比相同，各级压缩过程的多变指数n=1.3。生产1kg压缩空气理论上应消耗的功为 kJ/kg。（小数点后保留两位）
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