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The spacing of bars of perforations of fine screens used for the treatment of sewage, is_______________?

/ Civil Engineering Mcqs, Waste Water Engineering / By
The spacing of bars of perforations of fine screens used for the treatment of sewage, is_______________?

A. 2 to 3 mm
B. 3 to 5 mm
C. 5 to 8 mm
D. 8 to 10 mm