A （） pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.<br>A:injector<br>B:positive displacement<br>C:centrifugal<br>D:centripetal

A （） pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.
A:injector
B:positive displacement
C:centrifugal
D:centripetal

出自：海船船员证

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