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【单选题】
设计精馏塔时，若将原先塔釜直接蒸汽加热改为间接蒸汽加热，而保持进料量、组成、热状况和塔顶饱出液量、组成以及回流比不变，则塔釜液中轻组分含量（）
A.
增大；
B.
减小；
C.
不变；
D.
无法确定。
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参考解析：
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