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1. .The displacement thickness of a boundary layer is
(A): The distance to the point where (v/V) = 0.99
(B): the distance where the velocity v is equal to the shear velocity V∗ that is where v = V∗
(C): the distance by which the main flow is to be shifted from the boundary to maintain the continuity equation
(D): one-half the actual thickness of the boundary layer
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