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空气温度为td,湿度为Hd,相对湿度为φd的湿空气,经一间接蒸气加热的预热器后,空气的温度为t1,湿度为H1,相对湿度为φ1,则()。
- A、H1>Hd
- B、φd>φ1
- C、H1<Hd
- D、φd<φ1
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