A reciprocating pump belongs to （） according to its working principle.<br>A:injector pumps<br>B:positive displacement pumps<br>C:centrifugal pump<br>D:centripetal pumps

A reciprocating pump belongs to （） according to its working principle.
A:injector pumps
B:positive displacement pumps
C:centrifugal pump
D:centripetal pumps

出自：海船船员证

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