Which of the devices listed is common to all types of pumps?（）<br>A:A power end and fluid end<br>B:A propeller and educator<br>C:A volute and impeller<br>D:A turbine and piston

Which of the devices listed is common to all types of pumps?（）
A:A power end and fluid end
B:A propeller and educator
C:A volute and impeller
D:A turbine and piston

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