单项选择题
More than one stage of evaporation can take place by admitting the sea water into chambers with progressively （） pressure in the flash evaporator.
A.lower
B.higher
C.the lower
D.the higher
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In the process of （）, liquid changes into gas.
A.evaporation
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C.condensing
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单项选择题
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A.consume
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C.run
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Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl （）.
A.bottom
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