Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and （） or regenerative types.<br>A:reciprocating<br>B:hydraulic<br>C:turbine<br>D:vane

Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and （） or regenerative types.
A:reciprocating
B:hydraulic
C:turbine
D:vane

出自：海船船员证

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