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

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

出自：海船船员证

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