单项选择题
A.steady B.in pulsation C.continuous D.large
A centrifugal pump produces the required pressure energ...
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
The pressure head of a pump is given in the unit of （）....
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
A gear pump belongs to （） according to its working prin...
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
