单项选择题
Which of the listed statements is correct concerning refrigeration systems?（）
A.Dehydrators must be used continuously in a refrigeration system
B.A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours
C.A thermostatic expansion valve is used to control refrigerated space temperature
D.The liquid receiver functions to collect and remove non- condensable gases
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A.Hydraulic
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In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the（）.
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