The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the （）.<br>A:sliding block<br>B:pintle<br>C:reaction ring<br>D:tilting box or swash plate

The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the （）.
A:sliding block
B:pintle
C:reaction ring
D:tilting box or swash plate

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