单选题The control spindle operates the slipper ring or （） of the variable delivery pump, which controls the suction and discharge of the oil.Aservo-motorBswash plateCplungerDcylinder
单选题
The control spindle operates the slipper ring or （） of the variable delivery pump, which controls the suction and discharge of the oil.
A
servo-motor
B
swash plate
C
plunger
D
cylinder
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