单选题In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by（）Aopening more bypass linesBopening additional expansion valvesCadding refrigerantDspeeding up the machine
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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