When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.<br>A:to decrease scale formation<br>B:for better cooling effect<br>C:for more economical purpose<br>D:to raise vacuum

When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.
A:to decrease scale formation
B:for better cooling effect
C:for more economical purpose
D:to raise vacuum

出自：海船船员证

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