Which of the listed statements is correct concerning refrigeration systems?（）<br>A:Dehydrators must be used continuously in a refrigeration system<br>B:A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours<br>C:A thermostatic expansion valve is used to control refrigerated space temperature<br>D:The liquid receiver functions to collect and remove non- condensable gases

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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