The most commonly used substance to speed up the sedimentation of sewage is___________________?
(A) Lime
(B) Sulphuric acid
(C) Chlorine
(D) Sodium bisulphite
The most commonly used substance to speed up the sedimentation of sewage is___________________?
(A) Lime
(B) Sulphuric acid
(C) Chlorine
(D) Sodium bisulphite
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