In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ? = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?
A. Z.H.?/L

B. L/Z.H.?

C. H.?/L

D. Z.H/?L

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