单选题Which of the devices listed is common to all types of pumps?（）AA power end and fluid endBA propeller and educatorCA volute and impellerDA turbine and piston
单选题
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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