单项选择题
The flash-evaporator is different with the submerged-tube evaporator in that for the former（）
A.Water is heated into vapor on heating surfaces
B.Water is vaporized by pressure difference
C.There are no heating-transfer surfaces
D.There are more heating-transfer surfaces
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
