判断問題
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一般的には低圧下で蒸発し、溶液の沸点が低くなるため、蒸発時の熱伝達の温度差を大きくするのに有利である；加圧蒸発により得られる二次蒸気の温度は高く、次の工程での加熱蒸気として利用することができる。
低圧でも前段の熱交換を十分に活用する目的がある
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