单项选择题 The process during which liquid containing a reasonable amount of sensible heat at a particular pressure immediately changes into steam after admitted to a chamber at a lower pressure is called （）.

单项选择题 When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.

单项选择题 When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.