How can we determine whether the flow is laminar or turbulent?

1.	How can we determine whether the flow is laminar or turbulent?
A.	Reynold‚Äö√Ñ√∂‚àö√ë‚àö¬•s number
B.	Mach number
C.	Froude number
D.	Knudsen number
Answer» B. Mach number

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