Pick out the correct statement?

A. The property of a randomly packed bed (with raschig rings) is given by the ratio of the total

B. ume to the volume of voids in the bed

C. Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under

D. Mach number in an incompressible fluid is always unity

E. Fanning friction factor is inversely proportional to Reynolds number always

F. ditions of flow</strong>

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