精馏塔分离某二元混合物,规定产品组成xD、xW。当进料为时xF1,相应的回流比R1;当进料为时xF2,相应的回流比R2。若x F1 F2,进料热状态不变,则()。
A.
R1
B.
R1=R2
C.
R1>R2
D.
无法判断
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