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The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?

/ Environmental Engineering / By
The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?

A. 1 mg/litre
B. 10 mg/litre(Correct)
C. 100 mg/litre
D. 1000 mg/litre