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The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about | |
A. | 0.01 to 0.05 ppm [Wrong Answer] |
B. | 0.05 to 0.5 ppm [Correct Answer] |
C. | 0.5 to 1.0 ppm [Wrong Answer] |
D. | 1.0 to 5.0 ppm [Wrong Answer] |