_____ are often used to aid the return of condensate through the return piping of large complexes.

_____ are often used to aid the return of condensate through the return piping of large complexes.

_____ are often used to aid the return of condensate through the return piping of large complexes.




a. Boiler feed pumps
b. Vacuum injectors
c. Pressure controls
d. Vacuum pumps
e. Vacuum breakers






Answer: D


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