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某套管换热器,管间用2´105Pa(绝)的饱和水蒸气将管内作湍流流动的一定流量的空气由20℃加热至80℃,若将管间加热蒸汽压力提高到2.5´105Pa(绝)而其它条件不变(包括空气出口仍为80℃),则能加热的空气流量将为原来的 。A 1.71倍 B 1.113倍 C 1.25倍 D 0.99倍饱和水蒸气性质为:压力(Pa) 2´105 2.5´105温度(℃) 120.2 127.2
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