Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?（）<br>A:Gravity siphon effect<br>B:Higher vacuum in the second-stage<br>C:Difference in brine density between first and second stages<br>D:lower pressure in first-stage

Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?（）
A:Gravity siphon effect
B:Higher vacuum in the second-stage
C:Difference in brine density between first and second stages
D:lower pressure in first-stage

出自：海船船员证

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