Circle the odd ones.give reason for your choice :
1.screening primary sedimentation aeration
grit removal.
2.cholera dysentery jaundice
cancer.
3.scraper sewage
digester tank aerator.
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Circle the odd ones.give reason for your choice :
1.screening primary sedimentation aeration
grit removal.
2.cholera dysentery jaundice
cancer.
3.scraper sewage
digester tank aerator.
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