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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

In a vacuum boiling evaporator, the fresh water generated is pumped out by （）.

A.a brine pump
B.an air ejector
C.a feed water pump
D.a condensate pump

單項(xiàng)選擇題

With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by （）.

A.a brine pump
B.an air ejector
C.a feed pump
D.distillate pump