单项选择题
Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid （） pressure.
A.depending on
B.in relative to
C.regardless of
D.because of
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相关考题
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单项选择题
The gear and screw pumps are classified as （）.
A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps -
单项选择题
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 -
单项选择题
A vane pump belongs to （） according to its working principle.
A.reciprocating pump
B.positive displacement pump
C.centrifugal pump
D.centripetal pump
