单项选择题
A.Single stage or multistage
B.High pressure or low pressure
C.Open or close coupled
D.Horizontal or vertical
单项选择题 If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be （）.
单项选择题 To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the （）.
单项选择题 In a radial piston pump, reversal and control of fluid flow are accomplished by moving the （）.