单选题In a radial piston pump, reversal and control of fluid flow are accomplished by moving the （）.Acentral valveBradial plungerCfloating ringDcylinder body
单选题
In a radial piston pump, reversal and control of fluid flow are accomplished by moving the （）.
A
central valve
B
radial plunger
C
floating ring
D
cylinder body
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