单选题When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.Ato cut down the amount of cooling water neededBto prevent an excess amount of cooling water from being discharged to the bilgesCto supply hot water to the evaporator for more economical operationDNone of the above is tree
单选题
When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.
A
to cut down the amount of cooling water needed
B
to prevent an excess amount of cooling water from being discharged to the bilges
C
to supply hot water to the evaporator for more economical operation
D
None of the above is tree
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