单项选择题
A.lower B.higher C.low D.high
The flash-evaporator is different with the submerged-tu...
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
Which one of the followings might not be employed to cr...
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
The design of for a flash type evaporator is of critica...
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
