Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.<br>A:positive displacement<br>B:ejector<br>C:centrifugal<br>D:air compressor

Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.
A:positive displacement
B:ejector
C:centrifugal
D:air compressor

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