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单选题
Which of the following pumps belongs to centrifugal pump?（）
A
Piston pump
B
Screw pump
C
Diffuser pump
D
Water-ring pump
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单选题Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.A
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单选题Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（） (1) gear (2) centrifugal (3) screwA
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Electric motorC
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