单选题The flash-evaporator is different with the submerged-tube evaporator in that for the former（）AWater is heated into vapor on heating surfacesBWater is vaporized by pressure differenceCThere are no heating-transfer surfacesDThere are more heating-transfer surfaces
单选题
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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