For surface water system, the required residual disinfectant concentra – McqOptions

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1.	For surface water system, the required residual disinfectant concentration may not be less than _______mg/L for more than ___________hours before the first customer.
A.	0.2, 6
B.	2.0, 6
C.	0.2, 4
D.	2.0, 4
Answer» D. 2.0, 4

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