Pick up the correct statement from the following :

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Question:Pick up the correct statement from the following :

1. In treated sewage, 4 PPm of D.O. is essential

2. Only very fresh sewage contains some dissolved oxygen

3.The solubility of oxygen in sewage is 95% that is in distilled water

4.All the above.

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  1. Pick up the correct statement from the following :
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