Pick up the incorrect statement from the following

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Question:Pick up the incorrect statement from the following

1.Septic tanks are horizontal continuous flow type of sedimentation tanks

2. Septic tanks are generally provided a detention period of 12 to 36 hours

3.Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases

4.None of these.

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  1. Pick up the incorrect statement from the following
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