单选题The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as（）Aopposing operational dragBpressure distributionCdifferentialDsystem purge
单选题
The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as（）
A
opposing operational drag
B
pressure distribution
C
differential
D
system purge
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