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

Questions › Category: Civil Engineering › The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
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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

c) 100 mg/litre

d) 1000 mg/litre

Environmental Engineering Part 2