单项选择题
In the production of freshwater from seawater through a process of heating and cooling, the cooling phase of production is usually called （）.
A.evaporation
B.distillation
C.dehydration
D.condensation
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Which of the following statements is true concerning any evaporator?（）
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B.Increasing the absolute pressure of the shell will increase the distillers capacity
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A.damaged intake valves
B.excessively tight mounting bolts
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