单项选择题
A centrifugal pump produces the required pressure energy by means of a rotating （） provided with vanes.
A.propeller
B.impeller
C.circumference
D.screw
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相关考题
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单项选择题
The pressure head of a pump is given in the unit of （）.
A.kg
B.MPa
C.meter fluid column
D.None of the above is true -
单项选择题
A gear pump belongs to （） according to its working principle.
A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps -
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
