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1. The two stages involved in the purification of sewage in a septic tank are as follows
(A): Aerobic digestion both in the septic tank and in the subsoil
(B): Aerobic digestion in the septic tank,anaerobic digestion in the subsoil
(C): Anaerobic digestion both in the septic tank and in the subsoil
(D): Anaerobic digestion in the septic tank ,aerobic digestion in the sub soil
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