The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is________________?
(A) d² (0.011d + 0.785H)/Q
(B) d (0.022d + 0.085H)/Q
(C) d (0.785d + 0.011H)/Q
(D) d (0.285d + 0.011H)/Q
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is________________?
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