问题

Which of the following statements is/a

Which of the following statements is/are true regarding hydraulic pumps in general? （）

AVariable volumes can be obtained with gear pumps only by variation of the pump drive speed
BA radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft
CThe amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plate
DAll of the above

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