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civil engineering waste water engineering
1. Pick up the incorrect statement from the following for allowing workers to enter sewers
(A): None of these.
(B): Proper tests for the presence of poisonous gases must be carried out
(C): The men entering the manhole should be advised to smoke in the sewer
(D): The particular manhole and one manhole on up stream and one manhole on down stream should remain open for 30 minutes
(E): Warning signals should be erected
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