B.O.D. of treated water should be (A) 10 ppm (B) 25 ppm (C) 20 ppm (D) Nil

B.O.D. of treated water should be
(A) 10 ppm
(B) 25 ppm
(C) 20 ppm
(D) Nil
by

1 Answer

Answer :

(D) Nil
by

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