单选题The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the （）.Aslide blockBtilting boxCpintleDreaction ring
单选题
The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the （）.
A
slide block
B
tilting box
C
pintle
D
reaction ring
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