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单选题
In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by（）
A
opening more bypass lines
B
opening additional expansion valves
C
adding refrigerant
D
speeding up the machine
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system of bafflesC
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A thermostatic expansion valve is used to control refrigerated space temperatureC
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condenserC
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考题
单选题Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）A
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CondenserC
EvaporatorD
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