The Intrinsic distinction between the laminar flow and the turbulent flow is ( ) .
A.
velocity of turbulent flow is greater than that of laminar flow
B.
Re of laminar flow is less than that of turbulent
C.
larger cross-sectional area is turbulen t , while samller cross-sectional area is laminar.
D.
laminar flow without lateral mixing, while turbulent has lateral mixing.