You can live for weeks without food,but only days without water.
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Q68: Which of the following is considered to
Q69: Primary sewage treatment involves
A)aeration.
B)settling.
C)chemical treatment.
D)Primary sewage treatment
Q70: Secondary treatment of wastewater is not effective
Q71: Municipal water supplies are generally treated either
Q72: One of the advantages of treating sewage
Q74: Advanced treatment of wastewater can include any
Q75: Aeration of drinking water
A)removes odors.
B)increases dissolved air.
C)improves
Q76: The EPA drinking water standard for arsenic
Q77: The volume of water increases as it
Q78: In secondary treatment of sewage,which removes organic
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