Pick out the correct statement ?
A. In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity

B. 1 kcal/hr.m.C is equal to 1 BTU/hr. ft.F

C. In heat transfer by forced convection, Grashoff number is very important

D. In unsteady state heat conduction, heat flows in the direction of temperature rise

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