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【单选题】
完全不互溶物系多级逆流萃取,分配曲线一定时,最终萃取相中溶质质量分数的最高值()
A.
等于 1 ;
B.
取决于溶剂比;
C.
取决于萃取剂的组成;
D.
取决于原溶液的组成。
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【单选题】有一并联管路,如图所示,两段管路的流量,流速、管径、管一长及流动阻力损失分别为qv1,u1,d1,L1,∑hf1及qv2,u2,d2,L2,∑hf2若d1=d2进,L1=2L2,当两段管路中流体均作层流流动时,qv1/qv2=()。
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【单选题】有一并联管路,如图所示,两段管路的流量,流速、管径、管长及流动阻力损失分别为qv1,u1,d1,L1,Σhf1及 qv2,u2,d2,L2,Σhf2。若d1=2d2 ,L1=2L2。当两段管路中流体均作层流流动时,qv1/qv2为:
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mg src="http://p.ananas.chaoxing.com/star3/origin/2852d5995903cd1671c4845771741ebb.jpg">
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【单选题】有一并联管路,如图所示,两段管路的流量、流速、管径、管长及流动阻力损失分别为qv1,u1,d1,L1,Σhf1及 qv2,u2,d2,L2,Σhf2。若d1=2d2 ,L1=2L2。当两段管路中流体均作层流流动时, u1/u2为:
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mg src="http://p.ananas.chaoxing.com/star3/origin/2852d5995903cd1671c4845771741ebb.jpg">
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2
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4
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【单选题】I'm told that www.languagepractising.com is a free website ____ learners can not just learn vario
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【单选题】—I hope you can get good grades in the final exam. —____________.
A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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【单选题】有一并联管路,如图所示,两段管路的流量,流速、管径、管一长及流动阻力损失分别为qv1,u1,d1,L1,∑hf1及qv2,u2,d2,L2,∑hf2若d1=d2进,L1=2L2,当两段管路中流体均作层流流动时,qv1/qv2=()。
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