Gear pumps are （） type because they discharge a near constant amount of liquid regardless of pressure.<br>A:positive displacement<br>B:non-positive displacement<br>C:mixed-flow<br>D:axial-flow

Gear pumps are （） type because they discharge a near constant amount of liquid regardless of pressure.
A:positive displacement
B:non-positive displacement
C:mixed-flow
D:axial-flow

出自：海船船员证

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