单选题The purpose of an air compressor unloading device is to （）Adrain water from the air receiverBdrain water from the cylindersCdelay the compression process until the motor is up to speedDcheck pump alignment
单选题
The purpose of an air compressor unloading device is to （）
A
drain water from the air receiver
B
drain water from the cylinders
C
delay the compression process until the motor is up to speed
D
check pump alignment
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