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【单选题】
当流体在圆流动时,管中心的流速最大,若流动型态为层流时,平均流速u与管中心的最大流速 u max 的关系为( )A.
u = 0.99 u max
B.
u = 1.5 u max
C.
u = 0.5 u max
D.
u = 0.8 u max
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