The control spindle operates the slipper ring or （） of the variable delivery pump, which controls the suction and discharge of the oil.<br>A:servo-motor<br>B:swash plate<br>C:plunger<br>D:cylinder

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

出自：海船船员证

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