單項(xiàng)選擇題

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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單項(xiàng)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

單項(xiàng)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