单项选择题
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
单项选择题 A dirty intercooler on the ship service air compressor will result in （）.
单项选择题 The function of lubricating oil is to （）.
单项选择题 In a flash distilling unit, evaporator feed (seawater) first absorbs heat in the （）.
