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單項選擇題

Which one of the followings might not be employed to create vacuum for flash type evaporator? （）

A.high-pressure steam-driven air-ejector
B.motor-driven vacuum pump
C.water-motivated air eductor
D.centrifuge pump

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單項選擇題

The design of for a flash type evaporator is of critical importance because it must provide an optimum feedwater spray pattern that facilitates the flashing process, and it must also maintain a pressure differential between successive stages（）

A.condenser
B.flashing device
C.lashing device
D.vacuum pump

單項選擇題

A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced（）

A.lower condensing
B.higher cooling
C.lower cooling
D.higher condensing

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