当蒸馏海水时，蒸馏器排出的冷却水返回蒸发器作为给水，其目的是为了提高经济性，选C。
When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water .
当蒸馏海水时，蒸馏器排出的冷却水返回蒸发器作为给水，其目的是为了提高经济性，选C。
When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water .
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