Check valves are used to prevent _________ in piping when the flow stops.
a. overflow
b. continuous flow
c. trickle flow
d. backflow
a. Incorrect. Check valves are used to prevent backflow in piping when the flow stops.
b. Incorrect. Check valves are used to prevent backflow in piping when the flow stops.
c. Incorrect. Check valves are used to prevent backflow in piping when the flow stops.
d. Correct. Check valves are used to prevent backflow in piping when the flow stops.
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