The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?
(A) Bacterial stability factor
(B) Relative stability
(C) Biological oxygen demand (BOD)
(D) Oxygen ion concentration
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?
(A) Bacterial stability factor
(B) Relative stability
(C) Biological oxygen demand (BOD)
(D) Oxygen ion concentration
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