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Which of the following statements is/are true regarding hydraulic pumps in general? （）
A:Variable volumes can be obtained with gear pumps only by variation of the pump drive speed
B:A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft
C:The 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
D:All of the above

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出自：海船船员证

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