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【单选题】
已知精馏塔塔顶第一层理论板上的液相泡点为t1，与之平衡的气相露点为t2。而该塔塔底某理论板上的液相泡点为t3，与之平衡的气相露点为t4，则这四个温度的大小顺序为__________。A.
t1＞t2＞t3＞t4
B.
t1＜t2＜t3＜t4
C.
t1=t2＜t3=t4
D.
t1=t2＜t3=t4
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B.
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C.
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D.
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B.
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C.
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D.
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