单项选择题
流体在圆形直管中作滞流流动时,其直管阻力损失与流速u的关系为()
A.55次方成正比
C、与u的1.75次方成正比
D、与u成正比
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单项选择题
以0.01000mol/LK2Cr2O7溶液滴定25.00毫升Fe2+溶液,耗K2Cr2O7溶液25.00毫升。每毫升Fe2+溶液含铁(mg)(M(Fe)=55.85)
A.3351
B、0.5585
C、1.676
D、3.351
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单项选择题
H2A的pKa1=2.0,pKa2=5.0。溶液中当[H2A]=[A2-]时的pH值是()
A.0
B.3.5
C.2.5
D.7.0
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